The White House press secretary said the unspecified "enhancements" would take place this fall. The plane has been under scrutiny over whether it has sufficient defensive capabilities.
Some Democrats condemned the New York City mayor after he said his staff was discussing whether to arrest the Israeli prime minister when he arrives for the U.N. General Assembly.
President Donald Trump said on Monday he would cut the number of U.S. troops in Germany to 25,000, faulting the close U.S. ally for failing to meet NATO's defense spending target and accusing it of taking advantage of America on trade.
