Police identified the suspect as Khalid Masood, 52, on Thursday.
In a letter sent Thursday, the agency said there was no violation because President Trump was not receiving direct financial benefits from the hotel.
House Republican leaders abruptly canceled a planned vote on the GOP health care bill Thursday afternoon as they struggled to find sufficient support to pass it. A House GOP leadership aid confirmed to NBC News there would be no vote today. The move comes after House conservatives said there was no deal struck on the bill after a meeting with President Donald Trump at the White House Thursday. Tune in to MSNBC for continuing coverage and analysis.
The billionaire has a major stake in a fleet that flies a Chinese flag and visits Iran and Russia.
Constable Keith Palmer "left for work [Wednesday] expecting to return home at the end of his shift and had every right to expect that would happen."