The US Department of Defense confirmed on Wednesday that it had accepted a $400m Boeing 747 jet donated by Qatar for President Donald Trump's official usage.

The acceptance has sparked widespread criticism on legal and ethical grounds. Senate Democratic Leader Chuck Schumer described it as "the largest bribe from a foreign government in American history" and slammed the move as a stain on the presidency, according to Xinhua.

 President Trump dismissed the controversy, calling it "stupid" to reject the jet. Qatar also rejected the concerns.

A Department of Defense official confirmed that security upgrades will be implemented, with experts predicting retrofitting costs in the hundreds of millions, Xinhua reported