Republican Sen. Lindsey Graham of South Carolina said he wants Congress to investigate the claims made by President Donald Trump about former President Barack Obama wiretapping his phones.
But the prominent senator says his inquiry into the matter has been stonewalled by the Trump administration.
"If it’s not true, just tell me it’s not true. Why is it taking so long to get the answer?" Graham asked while on NBC's "Today" show on March 15. "I have no evidence of it, I’m suspicious of it, but now I’m getting concerned because it’s taking so long to answer my letter."
"The Congress needs to know what it's doing," Graham added. "If you're going to have multiple congressional investigations and there is a criminal investigation, we're going to run into it."
Graham's inquiry is reportedly not meant to substantiate Trump's claims that Obama wiretapped his phones during the 2016 presidential election, but rather as a challenge.
"If they don't honor this request and give us an answer, then I would say that we need a joint select committee because the regular order is not working," Graham said, according to Politico. "They’re about to screw up big time if they keep running to the Intel Committee and not answer that letter."
Graham added, "I think the entire country needs to know if there's something there."
Democrats have welcomed the inquiry because it fuels the idea the Russian government might be to blame for the failure of Democratic nominee Hillary Clinton's presidential campaign.
Democratic Sen. Tim Kaine of Virginia, who ran as Clinton's running mate, told CNN he believes the FBI is looking into the matter.
"Yes, the FBI is looking at it. That's what I expect to hear," Kaine said.
"We have to understand everything about the ties between Russia, the Trump campaign, the Trump transition, the Trump administration," said Kaine, who is a member of the Foreign Relations Committee. "Especially the degree to which Russia tried to invade the American election, because we have to protect future elections."
But Trump's claims have been disputed and Republican House Intelligence Committee Chairman Rep. Devin Nunes of California has spoken out about the accusation.
"I don't believe Trump Tower was tapped," Nunes said, according to CNN.
"We don't have any evidence that that took place and, in fact, I don't believe -- just in the last week of time, the people we've talked to -- I don't think there was an actual tap of Trump Tower," Nunes added.