President Trump Donald John TrumpSteele Dossier sub-source was subject of FBI counterintelligence probe Pelosi slams Trump executive order on pre-existing conditions: It 'isn't worth the paper it's signed on' Trump 'no longer angry' at Romney because of Supreme Court stance MORE on Friday rejected Apple's request to exempt parts of its new Mac Pro from import tariffs after the company said it is planning to move some production to China.

"Apple will not be given Tariff waivers, or relief, for Mac Pro parts that are made in China," Trump tweeted. "Make them in the USA, no Tariffs!"

Apple will not be given Tariff waiver, or relief, for Mac Pro parts that are made in China. Make them in the USA, no Tariffs! — Donald J. Trump (@realDonaldTrump) July 26, 2019

Apple shares dipped immediately after Trump's tweet.

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In filings made public this week, Apple asked the U.S. trade representative's office to exclude components of Apple's new Mac Pro from the list of products that could be hit by tariffs of 25 percent amid Trump's ongoing trade war with Beijing.

The Mac Pro has been manufactured in the U.S. for the past several years, but Apple last month moved some production of the devices to China.

Apple has increasingly found itself at the center of the U.S.-China trade war as its products land on lists expected to be hit by significant tariffs.

The U.S. and China have been engaged in a tit-for-tat trade war for the last several months, with the Trump administration levying billions of dollars in tariffs on Chinese goods and Beijing imposing retaliatory duties on American products.

The geopolitical struggle has been a test of Apple CEO Tim Cook's clout within the Trump administration. The president has often professed his admiration for Cook and touted his work on a White House workforce council. But Trump's tweet Friday indicates their personal relationship might not protect Apple from being swept up in the trade war.

Trump has threatened to impose tariffs on another $300 billion worth of Chinese imports, which, if implemented, would affect the iPhone, iPad, Mac, AirPods, AppleTV and more. Apple last month asked the Office of the U.S. Trade Representative to exclude those products from Trump’s tariff hit list, arguing the cost would harm Apple’s ability to compete with Chinese companies such as Huawei and chip away at the American company's ability to contribute to the U.S. economy.

The price for Apple products would likely spike if the tariffs are implemented.

U.S. Trade Representative Robert Lighthizer Robert (Bob) Emmet LighthizerWhiskey, workers and friends caught in the trade dispute crossfire GOP senator warns quick vote on new NAFTA would be 'huge mistake' Pelosi casts doubt on USMCA deal in 2019 MORE and Treasury Secretary Steven Mnuchin Steven Terner MnuchinOn The Money: Anxious Democrats push for vote on COVID-19 aid | Pelosi, Mnuchin ready to restart talks | Weekly jobless claims increase | Senate treads close to shutdown deadline Vulnerable Democrats tell Pelosi COVID-19 compromise 'essential' Pelosi asks panels to draft new COVID-19 relief measure MORE will travel to Shanghai on Tuesday to meet with Chinese Vice Premier Liu He for the first high-level, in-person trade negotiating session since talks collapsed in May.

—Updated at 3:49 p.m. Emily Birnbaum contributed.