Rep. Mark Meadows is resigning his congressional seat effective 5 p.m. Monday as he assumes the post of White House chief of staff.

Meadows will officially take over the White House post Tuesday.

Even while he held his House seat these last several weeks, the North Carolina Republican has been the de facto chief of staff. Meadows represented Trump in Senate negotiations on the $2.2 trillion economic rescue package to lessen the impact of the coronavirus pandemic and he has been a regular presence in the White House in recent weeks.

White House Social Media Director Dan Scavino, left, Acting White House Chief of Staff Mark Meadows, and National Security Adviser Robert O'Brien, walk to the West Wing as they return to the White House, Saturday, March 28, 2020, in Washington. President Donald Trump is returning from Norfolk, Va., for the sailing of the USNS Comfort, which is headed to New York. (AP PhotoAlex Brandon)

White House Social Media Director Dan Scavino, left, Acting White House Chief of Staff Mark Meadows, and National Security Adviser Robert O'Brien, walk to the West Wing as they return to the White House, Saturday, March 28, 2020, in Washington. President Donald Trump is returning from Norfolk, Va., for the sailing of the USNS Comfort, which is headed to New York. (AP PhotoAlex Brandon)

Meadows is Trump’s fourth chief of staff, taking over for Mick Mulvaney, who served as the acting chief of staff since January 2019.

Acting White House Chief of Staff Mark Meadows, left, walks with National Security Adviser Robert O'Brien to join President Donald Trump on Marine One as he departs the White House, Saturday, March 28, 2020, in Washington. Trump is en route to Norfolk, Va., for the sailing of the USNS Comfort, which is headed to New York. (AP PhotoAlex Brandon)

Acting White House Chief of Staff Mark Meadows, left, walks with National Security Adviser Robert O'Brien to join President Donald Trump on Marine One as he departs the White House, Saturday, March 28, 2020, in Washington. Trump is en route to Norfolk, Va., for the sailing of the USNS Comfort, which is headed to New York. (AP PhotoAlex Brandon)