Trump will explain tariffs on electronics on Monday

During Friday's press briefing, the White House refused to explain President Donald Trump's optimism that he can cut a deal with China on tariffs despite ABC News' Mary Bruce pressing Karoline Leavitt multiple times about the negotiations -- or lack thereof.

"The President, as I said from the podium, just a few days ago when I was up here, would be gracious, if China intends to make a deal with the United States," Leavitt said. "If China continues to retaliate, it's not good for China and the United States of America is the strongest, best economy in the world, as evidenced by the more than 75 countries who have called the administration immediately to cut good deals."

When pressed again on what is making Trump optimistic, Leavitt sidestepped, only saying "he's optimistic," without explanation.

-ABC News' Michelle Stoddart and Molly Nagle

ABC News's Mary Bruce asked White House press secretary Karoline Leavitt about the tariff situation with China and why President Donald Trump hasn't picked up the phone and negotiated directly.

Leavitt declined to respond.

"I will leave it to that, our national security team to get these discussions underway," she said.

In a new post on his media platform, President Donald Trump said that the U.S. is "doing really well on our TARIFF POLICY."

"Very exciting for America, and the World!!! It is moving along quickly," Trump said in Friday's post.

ABC News' Michelle Stoddart

President Donald Trump said he's negotiating with other countries on tariffs, but China still isn't one of them.

When asked by ABC News if there are any negotiations with China as this trade war ramps up, U.S. Trade Rep. Jamieson Greer said, "not at this point."

China's Ministry of Finance announced Friday that Beijing will increase tariffs on all U.S. goods from 84% to 125%.

China raising its tariffs is the latest tit for tat with the two sides locked in a faceoff.

--ABC News' Rachel Scott