He was in the room last week when the president shared the information with Russia's foreign minister and US ambassador at the White House.
Senate Democratic Leader Chuck Schumer of NY said the Intelligence Committee should have access to transcripts from last week's Oval Office meeting where Trump reportedly shared details about an Islamic State terror threat related to the use of laptop computers on aircraft with Russian Foreign Minister Sergey Lavrov and Russian ambassador to the U.S. Sergey Kislyak.
National Security Adviser H.R. McMaster called Trump's discussion with Russian diplomats "wholly appropriate".
"As President, I wanted to share with Russian Federation (at an openly scheduled W.H. meeting) which I have the absolute right to do, facts pertaining to terrorism and airline flight safety", Mr Trump said in an early morning tweet. "Humanitarian reasons, plus I want Russian Federation to greatly step up their fight against the IS & terrorism", he said in a pair of tweets on Tuesday.
"As for Donald Trump's post on Twitter, which has caused a new wave of this completely absurd scandal, I believe that he quite rightly said: Am I the president or who?"
Last week, he threw his administration into turmoil by taking the virtually unprecedented step of firing Federal Bureau of Investigation director James Comey, who had been overseeing a probe into possible Trump campaign collusion with Russian Federation to skew the presidential election.
"We have no way to know what was said, but protecting our nation's secrets is paramount", said Mr Doug Andres, a spokesman for Republican House Speaker Paul Ryan, adding that the latter hopes "for a full explanation". Trump and his team alleges that this is being done at the behest of those who are still loyal to the previous Obama administration. McMaster refused to say whether or not the information the president shared with Lavrov and Kislyak was classified.
Pushing back against allegations of damaging intelligence disclosures, President Donald Trump's national security adviser insisted Tuesday that Trump's revelations to Russian officials about the terrorist threat from the Islamic State group were "wholly appropriate" and amounted to a routine sharing of information.
Princess Kate speaks out about Pippa Middleton's upcoming wedding
It is likely that she will choose another British designer such as Middleton-favourite Jenny Packham or Alexander McQueen. People who simply can't stand the thought of any potential outbursts at their wedding simply shouldn't invite children.
But McMaster also said Trump wasn't briefed on the source and method of the intelligence.
The New York Times, which later picked up the story, said the ally had previously shared information with the USA only to see it leaked, and had warned U.S. officials that it may cut off access to such information if it is shared too widely.
Sen. Bob Corker, R-Tenn., chairman of the Senate Foreign Relations Committee, told reporters Monday evening that the Trump White House "has got to do something soon to bring itself under control and order". Any country that shares intelligence with U.S. officials "could decide it can't trust the United States with information, or worse, that it can't trust the president of the United States with information", said Representative Adam Schiff of California, the top Democrat on the House Intelligence Committee. The information - provided by another, as-yet-unnamed country - dealt with plans by the Islamic State to use laptop computers as weapons, and was so sensitive it had been withheld from allies and under close hold within the USA government as well. "We can not continue to let Israel be treated with such total disdain and disrespect", Trump said last December after the USA took the rare step of abstaining from a vote on a United Nations resolution condemning Israel's illegal settlement expansion in the occupied West Bank and East Jerusalem.
McMaster explained that Trump didn't even know where the information that he shared with Russian officials had come from, but experts say that the content of the information could help reveal its source.
Powell flatly said: "This story is false". He also said "the president wasn't even aware of where this information came from".
The party's number two in the Senate, Dick Durbin, said it was "one of the most serious allegations you can make against a leader - that they're in some way trying to delay or obstruct the administration of justice".
The Post report said Trump appeared to be boasting of the "great intel" he receives when he described a looming terror threat, citing an official with knowledge of the exchange.