Story highlights Comey's visit comes after Schiff accused the FBI director of stonewalling House members

Lawmakers have amped up their investigations into Russia's interference in the US elections

Washington (CNN) FBI Director James Comey spent Thursday afternoon on Capitol Hill meeting with the eight lawmakers who have access to the most highly classified information, sources told CNN.

Comey was scheduled to meet with the House members of the so-called Gang of Eight at 5 p.m., and he met earlier in the afternoon with the senators in the group -- including Senate Majority Leader Mitch McConnell, Senate Minority Leader Chuck Schumer, and the chairman and ranking member of the Senate Intelligence committee, Republican Sen. Richard Burr and Democrat Mark Warner respectively.

The House members include House Speaker Paul Ryan, House Minority Leader Nancy Pelosi, House Intelligence Chairman Devin Nunes and House Intelligence Ranking Member Adam Schiff.

Comey's visit comes after Schiff accused the FBI director of stonewalling House members in a briefing last week and both Schiff and Nunes aired their concerns that Comey had been withholding information from the group through last year.

Lawmakers have amped up their investigations into Russia's interference in the US elections and communications with the campaign of President Donald Trump. The House Intelligence Committee set an aggressive timeline of gathering intelligence by March 17 and hosting its first public hearing March 20.

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