“Other countries’ trade barriers and tariffs have been destroying [farmers’] businesses. I will open things up, better than ever before, but it can’t go too quickly. I am fighting for a level playing field for our farmers, and will win!” Trump tweeted Wednesday.

Republican senators expressed concern over the escalation of U.S. tariffs.

\"I'm not in great favor of tariffs either way....let's hope we can balance this out so it's not detrimental to our interests. I don't want it to be detrimental to other people's interest either but certainly our interests are important,\" Senate Finance chairman Orrin Hatch, R-Utah, told reporters Wednesday morning.

Hatch said he’s “mostly concerned about some of the things the president is maybe planning to do.”

“Our international trade is extremely important and we have to start off on the right track and I'm not sure we are right now,” he said.

Meanwhile, Senate Judiciary Chairman Chuck Grassley, R-Iowa, said the effects of the tariffs have been “very, very detrimental” and that he’s “very, very nervous about it.”

\"First of all, I'm a free trader. If we can get a level playing field...who wouldn't want the president to accomplish that?” he said on CNN's New Day. “But if [Trump] goes over the brink it's going to be catastrophic. And right now with the soybeans and corn in my state it is catastrophic, with the drop in prices that we've had.”

ABC News’ Mariam Khan contributed reporting to this story.

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