paul manafort

Conservative radio talk show host Rush Limbaugh's response to the Mueller indictments: "This is the coup." William Thomas Cain/Getty Images hide caption

Former Trump campaign chairman Paul Manafort, seen here leaving his home in Alexandria, Va., early Monday, was reportedly told to report to an FBI field office. Andrew Harnik/AP hide caption

A spokesman for Paul Manafort said, "Mr. Manafort has consistently cooperated with law enforcement and other serious inquiries and did so on this occasion as well." Mark Reinstein/Getty Images hide caption

Senate Judiciary Committee Chairman Charles Grassley, R-Iowa, and ranking member Sen. Dianne Feinstein, D-Calif., on Capitol Hill on April 3, 2017. Chip Somodevilla/Getty Images hide caption

Paul Manafort, President Trump's former campaign manager, has extensive ties to a pro-Russia political party in Ukraine, making him a person of high interest to congressional committees investigating Russia's role in the 2016 election. Matt Rourke/AP hide caption

Donald Trump Jr. and Paul Manafort are negotiating how to provide congressional testimony about their meeting with Russian lawyer Natalia Veselnitskaya. Alexander Zemlianichenko/AP hide caption

The House Intelligence Committee met behind closed doors in March on Capitol Hill. The committee is conducting one of several investigations of Russian attempts to interfere in the U.S. presidential election. Monday, former Obama administration officials are set to testify at a Senate Judiciary subcommittee hearing. Mark Wilson/Getty Images hide caption

Devin Nunes, R-Calif., chairman of the House Intelligence Committee, speaks to the media about the investigation of Russian meddling in the 2016 presidential election on Capitol Hill in Washington, D.C., on Friday. Nicholas Kamm/AFP/Getty Images hide caption