The U.S. and China ended trade negotiations Friday without a deal just hours after President Trump promised new tariffs on China if an agreement is not reached. And with no set deadline, Trump’s tweets are particularly worrisome to leaders in the retail space.

“Our industry is particularly exposed for a host of reasons,” said Rick Helfenbein, president and CEO of the American Apparel & Footwear Association on Yahoo Finance’s YFi PM. “We are kind of trapped. These tariffs will hurt us. They will hurt retail particularly badly.”

The Trump administration more than doubled U.S. tariffs on $200 billion in Chinese imports to 25% from 10%. The President threatened an additional 25% on almost all remaining $325 billion in goods from China.

And with 41% of all apparel produced in China, according to Helfenbein, President Trump’s threat to raise tariffs to 25% could have long-term implications.

“It’s painful,” said Helfenbein. “All of a sudden [last] Sunday at noon, the President tweets ‘we’re going to 25%.’ That bothered us. We weren’t able to grieve on the last $200 billion, and we don’t know if we’ll be able to grieve on the next $325 billion.”

Is the timing right?

But proponents of the U.S.’s move say this economic environment is the right time to play hardball.

“Right now we have great earnings in this country,” said The Brewer Group CEO Jack Brewer. “I don’t know that the President would have come out with a stance this hard if we didn’t have a 3.2% GDP number on the last report. When you are in the middle of a negotiation this big, you have to use all your guns.”

While Treasury Secretary Steven Mnuchin said talks were ‘constructive,’ President Trump tweeted tariffs ‘may or may not be removed depending on what happens with respect to future negotiations!’

And Helfenbein holds the timeline of negotiations is crucial.