Justice Department official Bruce Ohr will testify behind closed doors in the House on Tuesday, and give Republicans a chance to examine how President Barack Obama’s administration ultimately decided to investigate President Trump’s campaign.

Ohr, who at one point was the associate deputy attorney general in the Justice Department, has become the latest target of Republicans because of his connections to Christopher Steele. Republicans are convinced that Ohr was too close to Steele and used Steele’s questionable analysis to launch an investigation into Trump.