Senate Majority Whip John Cornyn plans to introduce an amendment to an Iran sanctions measure that would target the country's largest commercial airline.

Cornyn, R-Texas, in a Senate floor speech, said his amendment would require Homeland Security to list airports where Mahan Air operates and come up with increased security measures for Americans traveling to those airports.

Mahan Air, Cornyn said, "doubles as a preferred mode of transportation for terrorists and their weapons," and "is a conduit for personnel, weapons, and a violent ideology throughout the region."

Cornyn said Mahan has been expanding international routes, including airports in Europe.

"This is an obvious threat to the safety and security of the people where these planes are allowed to land," Cornyn said.

The Senate is set to begin debating amendments to the Iran sanctions bill this week.