Vice President Mike Pence also weighed in on the matter on Sunday, telling Fox News' "Sunday Morning Futures", "This administration believes in the freedom of the press. but maintaining the decorum that is due at the White House, I think is an issue that we'll continue to work for". "By the way, he has such an invitation, I told him of this". "We need for the appropriate conditions to exist, to be created, including in our countries".
It is not known when, or if, future Trump-Putin meetings might take place, though the White House said Trump is looking at sessions at the White House and the Kremlin.
Trump had initially invited Putin to Washington this fall for a follow-up meeting to their controversial Helsinki summit.
Collins' colleagues and press organizations, among them the White House Correspondents Association, offered their solidarity and criticized "the mistaken decision of the White House to impede access" by the journalist.
The president has been widely criticized for failing to publicly denounce Russia's interference in the 2016 US election and appearing to accept Putin's denials of such activity.
US President Donald Trump waves next to First Lady Melania Trump (L) as they board Air Force One at Andrews Air Force Base in Maryland on July 27, 2018.
Russian business people had hoped the Helsinki meeting, the first between the two presidents, would pave the way for a possible thaw in relations and delay, if not stop, the preparation of more sanctions which have followed thick and fast since Moscow's 2014 annexation of Ukraine's Crimea.
Collins' questions had focused on Trump's former lawyer, Michael Cohen.
"When you ask her if we ever used the word 'ban, ' then I will answer that question", Shine told reporters. The last time Trump was in the Russian capital was in 2013, to attend a Miss Universe beauty pageant.
But Wednesday, U.S. officials said the plan had been postponed until after the investigation of the special counsel, Robert Mueller, had concluded.
Trump has since tried to walk back at least some of his comments.
Meanwhile, secretary of state Mike Pompeo threatened Russian Federation with "severe consequences" for interfering in the U.S. election, adopting a tougher stance than Trump.
Russia is preparing for a meeting of Russian Security Council Secretary Nikolay Patrushev with U.S. National Security Advisor John Bolton, Moscow said on Friday. The audio mixer at the site in Helsinki did not bring up the question mic level in time to catch the beginning of Mason's question because the translator was still speaking, the official said.
Mr Putin "will not be welcome" at the Capitol, Senate Majority Leader Mitch McConnell told reporters.
House Speaker Paul Ryan said such invitations are reserved "for allies".