WASHINGTON – The Trump Administration is considering a new travel ban in the wake of another London terror attack, according to National Security Adviser H.R. McMaster.

“If you can’t screen people effectively to know who’s coming into your country, then you shouldn’t allow people from that country to travel,” McMaster Sunday told ABC’s “This Week” Sunday.

“This is something that we are looking at.”

Trump Friday called for “larger, tougher” travel restrictions in the wake of “another attack in London by a loser terrorist.”

On Sunday, he retweeted himself in calling for another travel ban.

“The travel ban into the United States should be far larger, tougher and more specific-but stupidly, that would not be politically correct!” Trump blasted out again on Sunday.

President Trump’s first travel restrictions on refugees and visitors from Muslim-majority countries were blocked by courts and panned by critics as a “Muslim ban.” Trump responded in March with a revised travel ban that was rolled out with better coordination across agencies and legal vetting.

But federal judges in Maryland and Hawaii blocked the order and it took the Supreme Court in June to allow parts of the travel ban to go into effect. Lawyers for Trump and opponents will argue the merits of the overall case before the Supreme Court Oct. 10.

McMaster called the travel ban a good “first step” for better screening individuals and for encouraging foreign governments to share more information for tougher vetting. He’s concerned about the strength of terrorist organizations’ ability to communicate and their ability to move people, money, drugs and weapons internationally.

“Why this is a greater danger than ever,” McMaster said.

In a separate appearance on Fox News Sunday, McMaster implied the president and the National Security Council are better off now that Steve Bannon has left the

White House. Bannon and his allies were at odds against McMaster for what they believed were his globalist views and tussled over national security decisions.

Trump is best served without people who try “to manipulate” a particular decision and “advance your agenda,” McMaster said when asked about Bannon.

“There were some who tried to operate outside of that process for their own narrow agendas and that didn’t serve the president well,” McMaster said.

Bannon has returned to running Breitbart News, a right-wing website that has pushed for a nationalist agenda and often mocked the establishment GOP agenda.