Trump supporters try to break through a police barrier, Wednesday, Jan. 6, 2021, at the Capitol in Washington. As Congress prepares to affirm President-elect Joe Biden's victory, thousands of people have gathered to show their support for President Donald Trump and his claims of election fraud. Credit: John Minchillo / AP

Steven Sund, the Capitol police chief, is resigning following the unprecedented violence that took place in the U.S. Capitol on Wednesday, CBS reports.

“It has been a pleasure and true honor to serve the United States Capitol Police Board and the Congressional community,” Sund wrote in his resignation letter, according to CBS.

House Speaker Nancy Pelosi had previously called for Sund to resign following Wednesday’s riot, where police were severely understaffed and easily overwhelmed by a pro-Trump mob. The rally that turned into a riot was planned weeks in advance, leading to questions from officials as to why Capitol police were not better prepared.