A U.S. government watchdog has agreed to review how classified information is kept secure at President Donald Trump's Mar-a-Lago resort in Florida, the agency said on Monday, after Democratic lawmakers raised concerns about the issue last month.

The Government Accountability Office's review will examine whether Secret Service agents subject Mar-a-Lago guests to any security screening, and evaluate the expenses incurred by government employees who travel with Trump to Mar-a-Lago, according to a letter the agency sent the lawmakers on Friday.

The GAO will also check whether Trump has made any payments to the U.S. Treasury from profits at his hotels, the letter said. Trump's lawyer pledged at a Jan. 11 news conference to donate Trump Hotel profits from foreign governments to the Treasury.