"We are substantially subsidising the militaries of many very rich countries all over the world, while at the same time these countries take total advantage of the USA, and our taxpayers, on trade, " he Tweeted.
In an interview with the Seattle Times, Tom Mattis, the older brother of soon-to-be-former Secretary of Defense James Mattis, recalled the phone conservation he had on Sunday after President Donald Trump chose to move up his brother's departure date to the beginning of the year.
Shanahan also has overseen the Pentagon's audit, its development of a new missile defence policy that still has not been released and a fledgling effort to reduce waste in military expenditures. Historically when a secretary has resigned, he has stayed on until a successor is confirmed.
Rogers said, "I think this one is going to leave a mark on the president, for a whole host of reasons".
Mattis offered his resignation a day after Trump ordered the withdrawal of the 2,000 or so U.S. troops from Syria and declared victory over the Islamic State militant group, a move that Mattis reportedly disagreed with strongly.
In typical fashion, Trump said Saturday that the media was treating him unfairly over the Syria withdrawal decision.
Brett McGurk, the U.S. special envoy to the anti-Islamic State group coalition, has resigned, a State Department official said Saturday, capping a chaotic week that saw the departure of Defense Secretary Jim Mattis and Donald Trump's stunning decision to pull troops from Syria.
Andrew Harrer-Pool Getty Images Secretary of State Mike Pompeo Mattis and national-security adviser John Bolton
Former President Barack Obama fired Mattis as head of U.S. Central Command in 2013 in large part because of Mattis' increasingly hawkish posture toward Iran.
He said the timing of Mattis' resignation reflects the differences of opinion on the withdrawals from Syria and Afghanistan. Deputy Defense Secretary Patrick Shanahan will take over the top civilian job at the Pentagon in an acting capacity.
Brett McGurk, the top U.S. envoy to the global coalition fighting the Islamic State militant group, also resigned in protest over Trump's Syria decision. "It is the very definition of patriotism and integrity", Tom Mattis added. "Even if I have get a little bit smaller, we will be okay".
"Since Washington crossed the DE at Christmas in 1776, American troops have missed holidays at home to defend our experiment in democracy", he says. "No anger", Tom Mattis told The Seattle Times.
The US has for years supported the Kurdish-led Syrian Democratic Forces (SDF) in the fight against IS in Syria.
Bernstein concluded: "They're talking to each other, there is coming to be a much greater consensus that he is unfit to be the president of the United States".