The Chinese Embassy in the U.S. on Tuesday laid out four hot-button issues it said should not be raised in President Trump’s meeting with Chinese President Xi Jinping this week.

“The four red lines in #China-#US relations must not be challenged,” the embassy wrote in a post on the social platform X.

The sticking points include the “Taiwan question,” “democracy and human rights,” “paths and political systems” and “China’s development right.”

The president arrived in Beijing on Wednesday morning. The two leaders are expected to discuss the Iran war, trade and U.S. arms sales to Taiwan in a bilateral meeting Thursday.

“We’re the two superpowers,” Trump told reporters as he departed the White House on Tuesday for the long flight to Beijing. “We’re the strongest nation on Earth in terms of military. China’s considered second.”

The president is facing bipartisan pressure to broach the sensitive subject of U.S. support for Taiwan. Eight Republican and Democratic senators urged Trump in a Monday letter to move forward with a $14 billion U.S. arms sale to the island country, which China considers part of its territory.

“President Xi would like us not to,” Trump told reporters ahead of the trip, referring to the sale.

The president added that he expected the Chinese president will “bring up Taiwan, I think more than I will.”

Additionally, human rights advocates and lawmakers have called on the president to place pressure on Xi to release American citizens detained by Chinese authorities. Trump told reporters ahead of the trip that he would bring up the release of Ezra Jin, a Christian pastor, and Hong Kong media mogul Jimmy Lai during his meeting with the Chinese president.

The leaders are also expected to discuss the Iran war. China is the largest purchaser of Iranian oil, and it has felt the brunt of the effective closure of the Strait of Hormuz, a major oil trading corridor, during the conflict. Secretary of State Marco Rubio told reporters last week that he hoped Beijing could convince Tehran to reopen the waterway.

Additionally, the two economic superpowers will discuss the creation of new economic partnerships and a possible extension of a trade truce during the visit. Trump’s tariffs on China have strained the relationship between the two countries, and the Chinese and U.S. leaders agreed to a trade truce last October after meeting in South Korea.

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