President Trump’s confirmation that the United States may accept a presidential aircraft gifted from Qatar marked the latest escalation in his clash with Boeing.

U.S. Senate Democratic Leader Chuck Schumer on Tuesday vowed to block all of President Donald Trump's nominees to the Justice Department until the agency reports what it knows about Qatar's offer to give Trump's administration a $400 million airplane.

Despite flying for more than 35 years, the current pair of Air Force One jets remain one of the safest and secure aircraft in the world.

The Qatari luxury jet offered to Trump is in San Antonio, Texas, suggesting that improvements to the plane may already be underway. But officials have raised security concerns.