He imposed the most significant overhaul of the F.B.I. in its history. After concluding that Russia had interfered in the 2016 election, he became a target of the president’s anger.
The appointment of Robert S. Mueller III as special counsel to conduct an investigation related to a sitting president roiled Washington around the start of President Trump’s first term.
The G.O.P. senator President Trump chose to lead the Department of Homeland Security privately discussed concessions the White House has repeatedly rejected.
The president issued a threat to deploy ICE agents in an apparent attempt to force Democrats to approve a new budget for the Department of Homeland Security.
While he was supposed to serve in a limited role as an adviser to Kristi Noem, Mr. Lewandowski had wide influence over contracts, personnel and operations inside the agency over the last year.