Kremlin spokesman Dmitry Peskov said NATO was "hostile" after Donald Trump threatened to pull the United States from the alliance

U.S. President Donald Trump says he’s strongly considering pulling the United States out of NATO. Trump remarks have ratcheted up his criticism of European allies and exposed a wider rift in the trans-Atlantic alliance.

After threatening to withdraw from the alliance, the president did not mention it in his address to the nation, and will meet the secretary general, Mark Rutte, next week

Rising tensions between the U.S. and Europeans are threatening to break up the alliance that has been the foundation of the post-World War II order.

By Andrew Gray and Trevor Hunnicutt BRUSSELS/WASHINGTON, April 1 (Reuters) - NATO Secretary-General Mark Rutte will visit Washington next week for what a spokesperson for the military alliance called a "long-planned visit" that comes after President Donald Trump blasted European allies over differences on the Iran war.

In his latest speech on the Iran war, Donald Trump outlined Washington’s stance but left out critical details that could shape the trajectory of the conflict. The omissions have raised fresh questions over the next phase of the war and how allies and global markets will respond.

A withdrawal from the alliance would require discussions with lawmakers and a defined process that does not appear to have started.