New tariffs on over $100 billion of Chinese goods are due to take effect on Sunday, but the Trump administration is sending mixed signals on delaying them as the United States and China keep haggling over a trade deal.

American officials have recently hinted in public remarks that President Trump could pause the new tariffs, which, if imposed, would expand American taxes to nearly every product imported from China. While many American officials are eager to avoid the tariffs, people with knowledge of the deliberations said that no decision had been made and that the president could go either way when he meets with advisers this week.

The United States and China announced in mid-October that they had reached a so-called Phase 1 trade agreement that would allow Chinese purchases of American agricultural goods to resume while the United States would cancel additional tariffs scheduled for Oct. 15. American officials said that future tariff increases could also be avoided if the pact were signed.

Since then, negotiators have continued to grapple over the deal’s terms. The two sides remain divided over how many of Mr. Trump’s tariffs will be canceled in return for China’s trade concessions, and over the terms that will govern Chinese purchases of tens of billions of dollars of American agricultural products.