Washington (CNN) President Donald Trump on Monday afternoon continued to tease an unannounced agreement between the US and Mexico, despite the Mexican Foreign Minister's declaration that there was no secret or outstanding deal between the two nations.

"We have an agreement on something that they will announce very soon. It's all done. They have to get approval," Trump told reporters Monday at the White House, noting that the approval would come from Mexico's legislative body.

"They will get approval. If they don't get approval, we'll have to think in terms of tariffs," he said.

Hours earlier, the President had tweeted, "We have fully signed and documented another very important part of the Immigration and Security deal with Mexico, one that the U.S. has been asking about getting for many years."

In both cases, Trump did not offer details about what was contained in the alleged agreement.

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