* U.S., China escalate trade war, U.S. consumers to feel pinch

* U.S. tariffs on $200 billion of Chinese goods, more may come

* China adds $60 billion to its tariff list, matches U.S. levels

* Trump says China seeking to undermine his political support

By Susan Heavey and Yawen Chen

WASHINGTON/BEIJING, Sept 18 (Reuters) - China and the United States plunged deeper into a trade war on Tuesday after Beijing added $60 billion of U.S. products to its import tariff list in retaliation for President Donald Trump's planned levies on $200 billion worth of Chinese goods.

The tit-for-tat measures are the latest escalation in an increasingly protracted trade dispute between the world's two largest economies.

On Monday, the U.S. administration said it will begin to levy new tariffs of 10 percent on about $200 billion of Chinese products on Sept. 24, with the tariffs to go up to 25 percent by the end of 2018.

"China is forced to respond to U.S. unilateralism and trade protectionism, and has no choice but to respond with its own tariffs," the Finance Ministry said in a statement on its website on Tuesday.

Beijing will impose levies on a total of 5,207 U.S. products - ranging from liquefied natural gas to certain types of aircraft as well as cocoa powder and frozen vegetables - at 5 and 10 percent, instead of previously proposed rates of 5, 10, 20 and 25 percent, the finance ministry said.

Both countries' tariffs come into force on Sept. 24.

So far, the United States has imposed tariffs on $50 billion worth of Chinese products to pressure China to make sweeping changes to its trade, technology transfer and high-tech industrial subsidy policies.

Beijing has retaliated in kind, but some analysts and American businesses are concerned it could resort to other measures such as pressuring U.S. companies operating in China.

While both sides said they were open to talks, Trump launched a Twitter broadside at China, accusing Beijing of targeting rural voters who had supported his presidency by hitting agricultural goods.

"China has openly stated that they are actively trying to impact and change our election by attacking our farmers, ranchers and industrial workers because of their loyalty to me," Trump wrote.

It was not clear what statement from Beijing Trump was referring to in his post. A short video published this summer by Beijing had suggested that farmers would not vote for Trump if their incomes were hurt by his trade policies.

Trump warned on Monday that if China takes retaliatory action against U.S. farmers or industries, "we will immediately pursue phase three, which is tariffs on approximately $267 billion of additional imports."