UPDATE 12:30 p.m.:
Former director of national intelligence James Clapper Jr. said that during his tenure, no wiretap was authorized against Donald Trump, despite Trump's claims that he was wiretapped.
"I can deny it," Clapper said, adding that he would "absolutely" be informed if a wiretap had been ordered.
UPDATE 11:28 a.m.:
Sen. Susan Collins (R-ME), a member of the Senate Intelligence Committee, said she has seen no evidence of President Trump's claims of wiretaps and urged the White House to hand over whatever evidence it had, CNN reported.
Susan Collins, who sits on Intel, says she has "seen no evidence" of Trump wiretapping claims - says WH should turn over evidence to panel— Manu Raju (@mkraju) March 5, 2017
UPDATE 11:11 a.m.:
Hours after President Trump requested that Congress investigate his claims that former President Obama wiretapped him, Sen. Tom Cotton (R-AR) said that claim would be part of the Senate's investigation into Russian interference in the election.
"I think all these matters will be part of our inquiry," Cotton, a member of the Senate Intelligence Committee, told Fox News' Chris Wallace.
Cotton said he had seen no evidence that Russia had colluded with Trump.
UPDATE 11:06 a.m.:
Senate Minority Leader Chuck Schumer (D-NY) rejected Trump's claims that Obama had wiretapped him, but said that if it was true, that would be even worse for Trump. Wiretapping would mean that a judge found probable cause that Trump had violated the law.
On the other hand, "if he falsely spread this kind of misinformation, that is so wrong," Schumer said on NBC's "Meet the Press."
Here's a clip from Schumer's appearance on the show.
UPDATE 10:08 a.m.:
A statement from President Trump on Sunday called for Congress to investigate whether former President Obama's administration abused its investigative powers.
This comes after Trump tweeted Saturday that Obama wiretapped him in Trump Tower, which an Obama spokesman has denied. Trump has yet to offer any evidence of a wiretap.
Here's the full statement.
House Minority Leader Nancy Pelosi (D-CA) called the statement a "misdirection."
ORIGINAL STORY: Trump spokeswoman Sarah Huckabee Sanders doubled down on Trump's claims he was wiretapped by then-President Obama in Trump Tower.
Trump is "going off of information that he's saying has led him to believe that this is a very real potential," Sanders said on ABC's This Week on Sunday.
Trump tweeted Saturday that Obama had wiretapped him after the election, calling Obama "bad (or sick)" and comparing it to "McCarthyism." He offered no evidence.
Here's a clip of the Sanders interview.
Sanders said one tweet in the initial tweetstorm "speaks for itself."
She also expressed skepticism of Obama's spokesman's denial of the wiretapping.
During the same show, Josh Earnest, Obama's former press secretary, insisted Obama does not have the authority to order any wiretapping. When asked if the Obama administration was involved in any way in wiretapping, Earnest said he did not know.
(1/4) Reports concerning potentially politically motivated investigations immediately ahead of the 2016 election are very troubling.— Sean Spicer (@PressSec) March 5, 2017
Current White House Press Secretary Sean Spicer tweeted before the shows started.
(2/4) President Trump is requesting that as part of their investigation into Russian activity, the congressional intelligence committees— Sean Spicer (@PressSec) March 5, 2017
He urged Congress to expand its investigation into Russian hacks to include wiretapping.
(3/4) exercise their oversight authority to determine whether executive branch investigative powers were abused in 2016.— Sean Spicer (@PressSec) March 5, 2017
(4/4) Neither the White House nor the President will comment further until such oversight is conducted.— Sean Spicer (@PressSec) March 5, 2017
This tweet came minutes before Sanders' interview, where she commented on the incident.
Former Attorney General John Mukasey said Trump was right that Obama's Department of Justice ordered surveillance on Trump Tower.
However, he said that Obama did not order that wiretap, but rather that the FBI did to gather information.
Spicer tweeted a quote from Mukasey.