In light of Attorney General Jeff Sessions recusing himself from the Russian investigation, a government watchdog group is asking every senator to provide a list of ambassadors they met with over the past three years.

“No prosecutor would ever bring that case,”@factdc says.

A spokeswoman for Sessions said that as a senator he had 25 conversations with ambassadors in 2016, including those representing Britain, South Korea, Japan, Poland, India, China, Canada, Australia, and Russia.

Matthew Whitaker, a former U.S. attorney for the Southern District of Iowa, now executive director of the Foundation for Accountability & Civic Trust, a watchdog group, said he has asked other senators to be transparent about their meetings.

“I think, in a sense, [meetings with foreign ambassadors to the United States] is fairly routine in the House and Senate, particularly in the Senate,” Whitaker told The Daily Signal. “It would be revealing to see how many meetings other senators have had.”

After federal investigators examined contacts between Sessions and Russian Ambassador to the United States Sergey Kislyak from last year, Sessions announced Thursday he would recuse himself from any investigation into Donald Trump’s presidential campaign.

Several news accounts say that Kislyak wasn’t shy about interaction with other senators. The Washington Post noted that Sen. Claire McCaskill, D-Mo., met at least twice with him—in 2013 and 2015, highlighting her tweets about the meeting.