Republican leadership in the House is calling on President Donald Trump to allow for the expiration of the Jones Act waiver later this summer in order to protect the U.S. maritime industry.

The waiver, which has been in place since March, has permitted refiners to use foreign-flagged ships to transport fuel between U.S. ports. The Trump administration moved to leverage this waiver as part of its broader attempt to lower oil and gasoline prices that soared all spring due to supply disruptions caused by the war in Iran.