White House economic adviser Kevin Hassett said on Sunday he was hopeful a dispute with Canada over accusations of the deadly fentanyl opioid entering the U.S. across its northern border could be resolved by the end of March.

U.S. President Donald Trump is keeping new tariffs in place on Mexico, Canada and China to pressure them to block the flow of the deadly opioid fentanyl into the United States, top White House economic officials said Sunday.

President Donald Trump sits down with Maria Bartiromo on ‘Sunday Morning Futures.’

U.S. President Donald Trump will not let up his pressure on tariffs on Mexico, Canada and China related to their handling of fentanyl, U.S. Commerce Secretary Howard Lutnick said on Sunday. "If fentanyl ends,

President Donald Trump teased that tariffs could climb higher over time while responding to Maria Bartiromo's questions about business leaders' desire for predictability.

Tariffs imposed by the US on Mexico and Canada could increase. President Donald Trump indicated when this might happen, informs CNN. On Thursday, Trump signed executive orders delaying tariffs on all goods from Mexico and Canada covered by the USMCA free trade agreement until April 2.