President Donald Trump is starting to lose confidence among some Republican lawmakers over his immigration policy, with Sen. Jerry Moran (R-KS) writing a brief letter to the editor of the Wall Street Journal, published on Tuesday, that all but pleads with the administration to stop being so restrictive with foreign workers, for the sake of the U.S. economy.

Moran, who has broadly praised Trump's leadership since his return to office, has nonetheless found fault with some of Trump's policies at least behind the scenes. A few months ago, he privately lobbied the White House to stop holding up foreign food aid, as the stockpiles sitting unused at U.S. ports were causing economic harm to his state.

Moran did not outright criticize Trump in his letter — but effectively said the administration needs to change course.

Recent events, he noted, including poor marks in U.S. student proficiency and the international incident caused by Trump's mass arrest of Korean workers at a Hyundai plant in Georgia, "underscore the urgent need for a skilled workforce to meet the growing demands of our economy."

"Meeting that demand will require common-sense immigration reform and expanding short-term work visas to ensure we are able to attract and retain workers in key industries," wrote Moran. "That effort must be accompanied by setting high expectations for students so that they have the skills our economy requires. Immigration reform should make certain American workers are considered first for American jobs, but Congress must match that priority with investments in workforce development. That means doubling down on technical training, community colleges and partnerships between federal, state and local entities."

His own state of Kansas, he noted, has a thriving trade school ecosystem that is supporting the growth of the aerospace industry in his state — but they can only do so much.

"The jobs of the future — manufacturing batteries, semiconductors and advanced materials — require a skilled workforce, and a stronger, more competitive workforce begins in our classrooms," he concluded. "As the Trump administration works to bolster American production, onshore jobs and strengthen key technical industries, Congress should think seriously about recruiting the necessary legal immigrant and skilled American workers who can provide what our economy needs."

This comes as multiple industries are reeling from the effect of Trump's immigration raids, including the agriculture sector.