Senate Republicans rejected legislation from Democrats on Tuesday that would have required President Donald Trump to end the U.S. energy blockade on Cuba unless he receives approval from Congress.

The vote on the war powers resolution showed that Republicans continue to back Trump in a range of global conflicts, including Venezuela, Iran, and Cuba — one of the U.S.'s closest neighbors yet a longtime adversary.

Democrats have repeatedly forced votes on legislation to put a check on the president's ability to deploy military force in those conflicts, but none have succeeded. Tuesday's vote was the first pertaining to Cuba and would have forced the president to get approval from Congress before launching any attacks on the island nation.

To dismiss the resolution, Republicans said that it was out of order because the U.S. is not engaged in outright hostilities with Cuba. The vote to dismiss the legislation succeeded on a 51-47 tally.

Sen. John Fetterman of Pennsylvania was the only Democrat who voted to dismiss the resolution, while Sens. Susan Collins of Maine and Rand Paul of Kentucky were the only Republicans to support it.

The Caribbean island is dealing with water and power outages as the U.S. imposes sanctions and interrupts oil shipments from Venezuela. The Trump administration is pressing Cuba's leadership to end political repression, release political prisoners, and liberalize its ailing economy.

Sen. Tim Kaine, D-Va., who introduced the war powers resolution, said the blockade had caused "humanitarian crises across Cuba," including disrupting medical care, leaving millions of people without clean water, and spiking food prices.

"My argument is that under the terms of the resolution, we are already engaged in hostilities with Cuba because we are using American force — primarily the Coast Guard, but other assets as well — to engage in a very devastating economic blockade of the nation," Kaine said.

Trump has said that after the war with Iran, he will turn his attention to Cuba. He pledged "a new dawn for Cuba" during a speech at a Turning Point USA event last week.

Democrats argued that the war powers resolution was also necessary to head off the potential for Trump to launch a military campaign against the nation.

"The United States and Cuba need to find a way to peacefully coexist," said Sen. Peter Welch, D-Vt.

Democrats have tried to mount political opposition to Trump's military actions by forcing votes through the War Powers Act of 1973, which was intended to assert congressional power over the declaration of war.

Sen. Rick Scott, R-Fla., accused Democrats of ignoring the human rights abuses of Cuba's leadership.

"President Trump is doing everything he can to bring back freedom and democracy all across Latin America, and we should do everything we can to support him," Scott said.