U.S. President Donald Trump says he doesn’t want to interfere in Britain’s election campaign. But his presence in London nine days before the Dec. 12 vote is a complication for Prime Minister Boris Johnson, and ammunition for his opponents.

Trump, who attending a meeting of NATO leaders, said Tuesday he’d “stay out of the election.” He said that “I don’t want to complicate it.”

But Trump also repeated his support for Brexit and said he thought Johnson would do “a good job.”

Britain's Prime Minister Boris Johnson attends a rally event as part of the General Election campaign, in Colchester, England, Monday, Dec. 2, 2019. British Prime Minister Boris Johnson and main opposition Labour Party leader Jeremy Corbyn paused to honor the two people killed in the London Bridge attack, then went back to trading blame for the security failings that allowed a man who had been jailed for terrorist crimes to go on a violent rampage in the heart of London. (Hannah McKayPool Photo via AP)

Britain's Prime Minister Boris Johnson attends a rally event as part of the General Election campaign, in Colchester, England, Monday, Dec. 2, 2019. British Prime Minister Boris Johnson and main opposition Labour Party leader Jeremy Corbyn paused to honor the two people killed in the London Bridge attack, then went back to trading blame for the security failings that allowed a man who had been jailed for terrorist crimes to go on a violent rampage in the heart of London. (Hannah McKayPool Photo via AP)

The main opposition Labour Party claims a post-Brexit U.S.-U.K. trade deal could damage the U.K.’s state-funded National Health Service.

Labour says drug prices could go up if the U.S. demands protection for its pharmaceutical firms.

The British government says the health service won’t be on the table.

Britain's Labour Party leader Jeremy Corbyn makes a speech on international and foreign policy in York, England, Sunday Dec. 1, 2019, ahead of the general election on Dec. 12. (Joe GiddensPA via AP)

Britain's Labour Party leader Jeremy Corbyn makes a speech on international and foreign policy in York, England, Sunday Dec. 1, 2019, ahead of the general election on Dec. 12. (Joe GiddensPA via AP)

Follow AP's full coverage of Brexit and British politics at https://www.apnews.com/Brexit