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U.S. President Donald Trump took to Twitter Monday morning and tweeted about the United States’ policy on North Korea, saying America has given “billions of dollars” to North Korea and received nothing in return.

READ MORE: ‘Military options are on the table’ with North Korea, White House aide says

“Our country has been unsuccessfully dealing with North Korea for 25 years, giving billions of dollars and getting nothing. Policy didn’t work!” Trump tweeted.

Our country has been unsuccessfully dealing with North Korea for 25 years, giving billions of dollars & getting nothing. Policy didn't work! — Donald J. Trump (@realDonaldTrump) October 9, 2017

Trump’s recent tweets on North Korea have prompted questions about whether the president is leaning toward military action.

On Saturday, Trump said U.S. “negotiators” were made to look like fools and “only one thing will work.”

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One prominent Senate Republican, Bob Corker, told The New York Times that he is concerned that Trump could set the U.S. “on the path to World War III.”

WATCH: Trump says to ‘stay tuned’ when it comes to North Korea

0:53 Trump says to ‘stay tuned’ when it comes to North Korea Trump says to ‘stay tuned’ when it comes to North Korea

Trump has previously said years of talking to North Korea and providing aid haven’t worked. But many of his tweets were ambiguous on whether he meant military action.

Budget director Mick Mulvaney later confirmed with NBC that Trump is “clearly telegraphing, and this should not be news to anybody,” and that “military options are on the table. … They absolutely are.”

*With files from the Associated Press