President Donald Trump is renewing his threat to veto a congressional resolution revoking his declaration of an emergency at the southern border. Trump had declared an emergency to try to circumvent Congress to access more money for his promised border wall.

The Senate is scheduled to vote Thursday on the resolution, with many Republicans expected to join Democrats in disapproving the declaration.

Trump tweeted early Thursday about "the big National Emergency vote today" in the Senate. He said, "I am prepared to veto, if necessary," and called the situation at the border "a National Security and Humanitarian Nightmare."

Trump has not yet vetoed a bill. Overturning a presidential veto requires a two-thirds vote in the House and Senate, but there aren't enough votes to do so on the border resolution.

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The Republican-led Senate is set to deal President Donald Trump a rebuke on his declaration of a national emergency at the Mexican border. The only remaining question is how many GOP senators will join Democrats in defying him.

Republicans say Thursday's showdown vote will result in Congress sending Trump a resolution blocking the border emergency he proclaimed last month to steer an extra $3.6 billion to building barriers. The Democratic-controlled House approved the measure last month.

Senate approval would force Trump to use a veto to protect his "Build the Wall" mantra over objections from his own party.

The vote also forces many GOP senators into a difficult box: defy Trump or assent to an emergency declaration that many lawmakers think goes too far.

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