Prominent Hong Kong democracy advocate and newspaper founder Jimmy Lai returned to court Monday to contest an attempt by the government to keep him in jail while facing charges under a sweeping new national security law.

Lai was brought to the Court of Final Appeal in a prison van and entered through an inflatable tunnel virtually connected to the van’s door as large numbers of journalists sought to capture the scene.

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Photographers cover democracy advocate Jimmy Lai arriving at Hong Kong's Court of Final Appeal where the government is arguing against allowing him bail in Hong Kong Monday, Feb. 1, 2021. Lai is charged with "collusion" under the new National Security Law that Beijing imposed on Hong Kong last year. (AP PhotoVincent Yu)

Prominent Hong Kong democracy advocate and newspaper founder Jimmy Lai returned to court Monday to contest an attempt by the government to keep him in jail while facing charges under a sweeping new national security law.

A protester waves a yellow umbrella to support democracy advocate Jimmy Lai as he arrives at Hong Kong's Court of Final Appeal where the government is arguing against allowing him bail in Hong Kong Monday, Feb. 1, 2021. Lai is charged with "collusion" under the new National Security Law that Beijing imposed on Hong Kong last year. The placard reads: "Hong Kong's National Security Law against constitution." (AP PhotoVincent Yu)

Hong Kong has jailed several pro-democracy activists in recent months, including student protest leaders Joshua Wong and Agnes Chow, for their involvement in the anti-government protests.

Democracy advocate Jimmy Lai arrives at Hong Kong's Court of Final Appeal where the government is arguing against allowing him bail in Hong Kong Monday, Feb. 1, 2021. Lai is charged with "collusion" under the new National Security Law that Beijing imposed on Hong Kong last year. (AP PhotoVincent Yu)

Lai, 72, made his fortune in the retail clothing trade before branching out into media. He stepped down as publisher of the Apple Daily newspaper but the publication remains a popular forum for opposition views in a media landscape dominated by Beijing-backed outlets.

Police officers stand guard as democracy advocate Jimmy Lai arrives at Hong Kong's Court of Final Appeal where the government is arguing against allowing him bail in Hong Kong Monday, Feb. 1, 2021. Lai is charged with "collusion" under the new National Security Law that Beijing imposed on Hong Kong last year. (AP PhotoVincent Yu)

Police officers stand guard as democracy advocate Jimmy Lai arrives at Hong Kong's Court of Final Appeal where the government is arguing against allowing him bail in Hong Kong Monday, Feb. 1, 2021. Lai is charged with "collusion" under the new National Security Law that Beijing imposed on Hong Kong last year. (AP PhotoVincent Yu)

Democracy advocate Jimmy Lai arrives at Hong Kong's Court of Final Appeal where the government is arguing against allowing him bail in Hong Kong Monday, Feb. 1, 2021. Lai is charged with "collusion" under the new National Security Law that Beijing imposed on Hong Kong last year. (AP PhotoVincent Yu)

Democracy advocate Jimmy Lai arrives at Hong Kong's Court of Final Appeal where the government is arguing against allowing him bail in Hong Kong Monday, Feb. 1, 2021. Lai is charged with "collusion" under the new National Security Law that Beijing imposed on Hong Kong last year. (AP PhotoVincent Yu)

Lai was arrested last month in a sweep against pro-democracy activists accused over their involvement in 2019 anti-government protests. First refused bail, Lai was released on appeal, leading to attacks on the judiciary from the ruling Communist Party’s mouthpiece People’s Daily. He was returned to jail on New Year's Eve awaiting a new hearing.

Photographers cover democracy advocate Jimmy Lai arriving at Hong Kong's Court of Final Appeal where the government is arguing against allowing him bail in Hong Kong Monday, Feb. 1, 2021. Lai is charged with "collusion" under the new National Security Law that Beijing imposed on Hong Kong last year. (AP PhotoVincent Yu)

Photographers cover democracy advocate Jimmy Lai arriving at Hong Kong's Court of Final Appeal where the government is arguing against allowing him bail in Hong Kong Monday, Feb. 1, 2021. Lai is charged with "collusion" under the new National Security Law that Beijing imposed on Hong Kong last year. (AP PhotoVincent Yu)

Hong Kong has jailed several pro-democracy activists in recent months, including student protest leaders Joshua Wong and Agnes Chow, for their involvement in the anti-government protests.

The national security law was imposed on Hong Kong by Beijing after the city's local legislature was unable to overcome opposition to its enactment. Opponents see the law as a betrayal of China's pledge to maintain the city's legal, civil and human rights for 50 years after the handover from British colonial rule in 1997.

The law criminalizes acts of subversion, secession, terrorism and collusion with foreign powers to intervene in the city’s affairs, effectively curbing most opposition political activity and subjecting private speech and social media postings to possible criminal punishment. Serious offenders could face up to life imprisonment.

A protester waves a yellow umbrella to support democracy advocate Jimmy Lai as he arrives at Hong Kong's Court of Final Appeal where the government is arguing against allowing him bail in Hong Kong Monday, Feb. 1, 2021. Lai is charged with "collusion" under the new National Security Law that Beijing imposed on Hong Kong last year. The placard reads: "Hong Kong's National Security Law against constitution." (AP PhotoVincent Yu)

A protester waves a yellow umbrella to support democracy advocate Jimmy Lai as he arrives at Hong Kong's Court of Final Appeal where the government is arguing against allowing him bail in Hong Kong Monday, Feb. 1, 2021. Lai is charged with "collusion" under the new National Security Law that Beijing imposed on Hong Kong last year. The placard reads: "Hong Kong's National Security Law against constitution." (AP PhotoVincent Yu)

Lai, 72, made his fortune in the retail clothing trade before branching out into media. He stepped down as publisher of the Apple Daily newspaper but the publication remains a popular forum for opposition views in a media landscape dominated by Beijing-backed outlets.

Democracy advocate Jimmy Lai arrives at Hong Kong's Court of Final Appeal where the government is arguing against allowing him bail in Hong Kong Monday, Feb. 1, 2021. Lai is charged with "collusion" under the new National Security Law that Beijing imposed on Hong Kong last year. (AP PhotoVincent Yu)

Democracy advocate Jimmy Lai arrives at Hong Kong's Court of Final Appeal where the government is arguing against allowing him bail in Hong Kong Monday, Feb. 1, 2021. Lai is charged with "collusion" under the new National Security Law that Beijing imposed on Hong Kong last year. (AP PhotoVincent Yu)

Police officers stand guard as democracy advocate Jimmy Lai arrives at Hong Kong's Court of Final Appeal where the government is arguing against allowing him bail in Hong Kong Monday, Feb. 1, 2021. Lai is charged with "collusion" under the new National Security Law that Beijing imposed on Hong Kong last year. (AP PhotoVincent Yu)

Police officers stand guard as democracy advocate Jimmy Lai arrives at Hong Kong's Court of Final Appeal where the government is arguing against allowing him bail in Hong Kong Monday, Feb. 1, 2021. Lai is charged with "collusion" under the new National Security Law that Beijing imposed on Hong Kong last year. (AP PhotoVincent Yu)

Democracy advocate Jimmy Lai arrives at Hong Kong's Court of Final Appeal where the government is arguing against allowing him bail in Hong Kong Monday, Feb. 1, 2021. Lai is charged with "collusion" under the new National Security Law that Beijing imposed on Hong Kong last year. (AP PhotoVincent Yu)

Democracy advocate Jimmy Lai arrives at Hong Kong's Court of Final Appeal where the government is arguing against allowing him bail in Hong Kong Monday, Feb. 1, 2021. Lai is charged with "collusion" under the new National Security Law that Beijing imposed on Hong Kong last year. (AP PhotoVincent Yu)