Second GOP lawmaker calls on Trump to share info on wiretapping claims
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GOP Rep. Justin AmashJustin AmashGOP Rep. Amash slams Kavanaugh on government surveillance rulings House Freedom Caucus roiled by Trump's attacks on Mark Sanford Freedom Caucus to Trump: Lay off Sanford attacks MORE (Mich.) on Saturday called on President Trump to release information backing up his allegation that former President Barack ObamaBarack Hussein ObamaObama in Kenya for launch of sister’s sports center Get ready for summit with no agenda and calculated risks US envoy to Russia: 'Highly unlikely' that Trump will recognize Russia annexation of Crimea MORE had wiretapped Trump Tower during the campaign.

"This allegation has serious implications. @POTUS should provide more info to Congress immediately to assess constitutionality and legality," wrote Amash, a frequent Trump critic.

Amash's tweet echoed remarks from two other Republicans on Saturday, Sens. Ben Sasse (Neb.) and Lindsey GrahamLindsey Olin GrahamOvernight Health Care: Watchdog finds Tom Price improperly used funds on flights | Ex-Novartis CEO sent drug pricing proposal to Cohen | HHS staffers depart after controversial social media posts HHS staffers depart after controversial social media posts: report Senate takes symbolic shot at Trump tariffs MORE (S.C.), who indicated they were pushing for more information.

Graham said he was "very worried" about Trump's claim that Obama ordered a wiretap of Trump Tower before the November election. He said an illegal wiretap would represent "the biggest political scandal since Watergate," while the ability of the Obama administration to legally obtain a warrant would also be a scandal.

Trump on Saturday claimed Obama had his “wires tapped” in Trump Tower before Election Day, tweeting the accusation without offering evidence. 

“Terrible! Just found out that Obama had my ‘wires tapped’ in Trump Tower just before the victory. Nothing found. This is McCarthyism!” Trump wrote, adding in another that Obama was "turned down by court earlier."

Sasse noted that such a wiretapping warrant would have been approved by a court under the Foreign Intelligence Surveillance Act (FISA).

According to a senior White House official cited by The New York Times, Trump's chief counsel Don McGahn was working on Saturday to secure access to what he believed to be an order issued by the FISA court involving surveillance related to Trump or associates. 

The Times reported that the official didn't offer evidence supporting the idea that such an order exists, but noted that it would be "highly unusual" for the White House to order the Department of Justice to turn over such an order given a tradition of independence for law enforcement.