Cuba hard-liner Sen. Marco Rubio Marco Antonio RubioMurky TikTok deal raises questions about China's role Sunday shows preview: Justice Ginsburg dies, sparking partisan battle over vacancy before election Florida senators pushing to keep Daylight Savings Time during pandemic MORE is backing legislation to strengthen the security at the island nation's airports, where commercial U.S. flights have been landing for over a year.

The Florida Republican, who has also been calling for a tougher response to a series of bizarre attacks on U.S. diplomats in Havana, reintroduced a bill on Thursday that would require the Transportation Security Administration (TSA) to assess each of Cuba’s 10 international airports and brief Congress about it.

The House on Monday unanimously passed an identical bill, which is sponsored by Rep. John Katko (R-N.Y.).

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“Even as regular passenger flights occur between the U.S. and Cuba, the Castro regime remains a top national security threat to the United States and is a close ally of countries like Iran, Russia, Venezuela and North Korea,” Rubio said in a statement. “The United States government needs to ensure robust security measures are in place in order to keep Americans safe.”

Similar legislation was introduced last year after a delegation of lawmakers was denied visas to inspect Cuba’s airports themselves.

The lawmakers want to know whether airports are complying with new aviation security measures and keeping up with evolving threats, especially as U.S. officials warn that the threat to aviation remains as high as ever.

But last year’s bill would have halted all flights to Cuba until new security measures were implemented. Commercial air service resumed between the U.S. and Cuba for the first time in 50 years last summer as part of former President Obama’s historic opening with the island nation.

Lawmakers have backed off of their effort to end flights to Cuba. However, they are still pushing legislation to strengthen airport security on the island.

Rubio’s measure would require the TSA to standardize all federal air marshal agreements with foreign partners and establish an agreement with the Cuban government to allow TSA inspectors to conduct complete assessments of Cuban airports.

The legislation also would require U.S. airlines to publicly disclose if they have contracts with entities controlled by the Cuban government, which are sometimes used to hire airline employees and conduct airline operations on the ground.

Bill sponsors say the measure will encourage American airlines to directly hire their own employees — a step they say is necessary given the potential threat of insider access.

“The fact that the Cuban government controls the vetting and hiring of many of the airport employees in Cuba is a serious vulnerability," Rubio said.