California Republican Devin Nunes is doubling down on efforts to go after the people who investigated Donald Trump’s collusion with Russia in the 2016 campaign, the Washington Times reports.

As head of the Permanent Select Committee on Intelligence, Nunes wants to target the people who were involved in the Steele Dossier which exposed Trump’s dealings with Russian intelligence and helped lead to the revelation that Donald Trump Jr. colluded with Russian intelligence agents to try to get dirt on Democrat Hillary Clinton.

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Nunes is asking two other committees in the Republican-lead congress to call Obama administration officials, FBI agents and outside political activists to offer public testimony. He ha a list of 42 people including FBI agents, Justice Department and State Department officials and anti-Trump activists with whom they communicated.

Among the people the Times says Nunes wants to target are Glenn Simpson, who founded Fusion GPS, the firm that wrote the bombshell Steele dossier.

He also wants to investigate Robby Mook, Hillary Clinton’s campaign manager who is now a CNN analyst. Mook was one of the first Clinton allies to blame Russia as behind the hacking of Democratic Party computers.