Washington D.C., United States—U.S. President Donald Trump has said that the Pentagon is considering the installation of a permanent military mission in Poland.

Previously during a White House meeting, Polish President Andrzej Duda had requested from President Trump the building of a new, permanent U.S. military base on Polish soil. He argued that this would serve as a deterrent and bulwark against Russian aggression. He proposed that is should be baptized “Fort Trump.” The Polish head of state even proposed to donate more than $2 billion for the funding of the project.

Both presidents said that Russia has been acting aggressively in the region. They cited the examples of Georgia (2008), the Baltics, Crimea, and Ukraine.

“We’re looking at it very seriously, I know Poland likes the idea very much, and it’s something that we are considering, yes,” said Trump.

Earlier in the year, the Polish Defense Ministry released a report on the merits of a permanent U.S. military presence. “Russia is seeking to strengthen its political and economic relations with key European countries at the expense of US national interests. An increased permanent presence in Poland will give America the strategic flexibility it needs to confront and deter these threats,” said the report.

Poland, a former Warsaw Pact member, joined NATO alongside Hungary and the Czech Republic in 1999. This happened against fervent Russian opposition, which had been led to believe that NATO wouldn’t extend an invitation to the former Eastern Bloc countries.

This isn’t the first time Poland has requested for the constant presence of U.S. military units. A concession between no-troops and a permanent deployment has been achieved with the rotation of U.S. armored Brigade Combat Teams (BCT) under Operation Atlantic Resolve.

US Defense Secretary Jim Mattis said the Pentagon is considering the proposal.