The White House took aggressive aim at Amazon, with President Donald Trump putting in a call to Amazon founder Jeff Bezos Tuesday morning, after the company considered displaying the added cost of tariffs on certain items.

The White House press secretary, Karoline Leavitt, attacked the retail giant over a report that suggested Amazon would highlight tariff-related price increases. Amazon said it was “not going to happen.

The White House called Amazon’s plan to display an item’s tariff costs a “hostile and political act,” prompting Trump to call Jeff Bezos.