Sen. John McCain (R-AZ) on Wednesday called for a select committee to investigate Russian influence in the 2016 presidential election and potential ties between the Donald Trump campaign and Russian officials, telling MSNBC’s Greta Van Susteren that Congress lacks the credibility to “handle this alone.”

McCain was reacting to revelations that House Intel Chairman Devin Nunes (R-CA) met with Trump on Wednesday to brief him on new information suggesting the president may have been monitored—legally—through “incidental collection.”

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Nunes informed the president and the press before sharing the details with fellow members of of the House Intelligence Committee, prompting Rep. Adam Schiff’s (D-CA) to blast the House Intel chairman’s decision.

In an interview with Van Susteren, McCain called the situation “bizarre,” arguing, “no longer does the Congress have credibility to handle this alone.”

“I don’t say that lightly,” McCain added.

Watch the video below, via @Greta:

.@SenJohnMcCain on Trump-Russia probe: “No longer does the Congress have credibility to handle this alone” –FTR https://t.co/orcnKC0uYu — Greta Van Susteren (@greta) March 22, 2017