Apple Inc, Keurig Dr Pepper Inc and Dollar Tree Inc have joined other companies in filing letters of opposition to a Trump administration plan for more U.S. tariffs on Chinese goods, including iPhones, MacBooks, single-serve coffee brewers and value items.

The U.S. and China are resuming talks to end a trade war after more than a month's hiatus. U.S. President Donald Trump and Chinese President Xi Jinping are expected to meet at the G20 summit in Japan next week, and both sides' trade representatives will talk on phone before two leaders meet.

Trump had said he would consider extending tariffs to another 300 billion U.S. dollars of Chinese goods if China does not yield progress on the trade dispute.

The new round of tariffs would reduce Apple's competitiveness and cut the contributions it could make to the U.S. Treasury, Apple said in an online filing on Thursday.

Apple said in the document it is the largest U.S. corporate taxpayer to the U.S. Treasury and reiterated its 2018 pledge to directly contribute over 350 billion U.S. dollars to the U.S. economy over five years.

Apple said it would also take a hit because Chinese and other non-U.S. firms do not have a significant U.S. market presence.

"A U.S. tariff would, therefore, tilt the playing field in favor of our global competitors," Apple said.

Coffee and beverage firm Keurig Dr Pepper and technology giant Apple are the latest in a growing list of U.S. companies pressing the Trump administration to abandon the plan of extending the tariffs.

Air conditioner maker Carrier Inc, a unit of United Technologies Corp, said the latest round of tariffs on air conditioner parts "will result in significant price increases for U.S. consumers of U.S.-manufactured HVAC equipment," making them less likely to replace older, inefficient systems.

Companies such as Dell Technologies Inc, HP Inc, and Walmart Inc have already voiced their opposition.

A few days ago, the Office of the U.S. Trade Representative (USTR) launched seven days of public hearings on Trump's potential tariffs on Chinese goods. Anticipatedly more than 300 scheduled witnesses including eletronics retailer Best Buy, clothing retailer Ralph Lauren Corp, toy maker Hasbro Inc, vacuum cleaner maker iRobot would send represetatives to the hearing.

Also, last week, more than 600 American firms including Walmart, the world's largest retailer, jointly wrote to Trump administration for a prompt settlement on China-U.S. trade disputes.

The proposed list, which will be ready for a decision by Trump as early as July 2, includes nearly all consumer products. It has been loudly opposed by retailers like Dollar Tree, which is one of the top 50 U.S. employers and seventh largest importer, the company said in its public comments.

"Simply put, the imposition of an additional 25 percent duty on the types of everyday, household products that we offer will have a significant and disproportionate negative impact on middle- and low-income American households," Dollar Tree said.

The tariffs could also hit Christmas sales hard, particularly cellphones, computers, toys and electronic gadgets.

(With input from Reuters)