Washington DC - President Donald Trump is facing increasing pushback from his own Republican Party over his comments about a possible US withdrawal from NATO.

In a joint statement released on Wednesday, Democrat Chris Coons and Republican Mitch McConnell, the former Senate majority leader, insisted that Americans were safer when NATO was strong.

"The Senate will continue to support the alliance for the peace and protection it provides America, Europe, and the world," the statement said.

Trump would not be able to unilaterally decide on a withdrawal on his own and would need an unlikely two-thirds majority in the Senate

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The two senators also pointed out that NATO has gone to war only once since its founding in 1949, in response to the September 11, 2001 attacks on the US.

"NATO troops fought and died in Afghanistan and Iraq alongside American forces. The United States must not take this sacrifice – nor our allies' commitment to make it again – lightly," they wrote.

Trump and Secretary of State Marco Rubio have repeatedly threatened to quit NATO over allies' refusal to get involved in the unprovoked US-Israeli war on Iran.

When asked if he would reconsider NATO membership, Trump told the Telegraph in an interview publish Wednesday: "Oh yes, I would say [it's] beyond reconsideration."