Trump in Graham's cross hairs as Russia probe kicks off

Graham, meanwhile, said the subcommittee investigation is “going to find out all things Russia,” noting that he and Whitehouse are both former prosecutors. “I couldn’t have a better partner than Sen. Whitehouse,” he said.

“We’re trying to build a case,” Graham added. “So, this is what Russia’s doing in other places. Then we’re going to dig into what they did here.”

Graham said the probe would focus “on what laws may have been broken by the Russians and if we don’t have laws to protect from this kind of stuff, we’re going to need to create some.”

The South Carolina senator has emerged as one of Trump’s top GOP critics on Capitol Hill, along with his close friend, Senate Armed Services Chairman John McCain (R-Ariz.).