President Donald Trump is asking American growers to bear with him as tariffs threaten to hurt their business and deepen a farm downturn that’s entering a third year.

Farmers and meat producers across the U.S. can expect the new tariffs on Mexico, Canada and China and the retaliation to hurt their bottom lines by billions of dollars if they stay in place a while.

Trump said Americans will have to “bear with” him through an “adjustment period.” He also reiterated that he will announce a sweeping agriculture tariff to take effect April 2.