WASHINGTON — U.S. senators are due to vote on a resolution on Thursday that could keep President Donald Trump from attacking Venezuela without congressional authorization, a day after administration officials told lawmakers that Washington did not yet have a legal justification for strikes on Venezuelan territory.

The Senate is due to vote on Thursday evening on a war powers resolution whose lead sponsors are Democrats Tim Kaine and Adam Schiff and Republican Senator Rand Paul. Weeks of U.S. strikes on boats off Venezuela’s coast have heightened concern that Trump will launch an attack on the country’s territory.

Trump has dangled the possibility of land attacks on Venezuela for weeks, saying at one point that he had authorized the Central Intelligence Agency to conduct covert operations

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