"Build the wall" was one of US President Trump's signature campaign pledges in his first run for office in 2016.
Republicans are predicting that 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 border barriers. Five Republican senators have said they back the measure. At least four Republicans are needed to pass it in the 100-seat Senate, along with all 45 Democrats and two independents.
"I am prepared to veto, if necessary," Trump said in an early-morning post on Twitter before senators took up the measure.
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