Iran live updates: Trump announces he's extending ceasefire

Gen. Ali Abdollahi, the commander of Iran's Khatam al-Anbiya Central Headquarters -- the country's top joint military command -- said on Tuesday that Tehran is prepared to "respond decisively to the enemy's breach of promises," as quoted by the official Islamic Republic News Agency.

"The enemy is desperately seeking a ceasefire" due to the "crushing and destructive blows" of the Iranian missile and drone attacks, Abdullahi said.

Iranian state television reported on Tuesday morning that no delegation had departed for Islamabad.

Iranian officials, the broadcaster said on Telegram, maintain that they "do not accept negotiations under the shadow of threats or broken promises" and that any continued participation in talks depends on a change in "the behavior and positions of the Americans."

Iranian Ambassador to Pakistan Reza Amiri Moghadam said in a post to X on Tuesday that Iran "will Not negotiate under Threat and Force," as U.S. and Iranian representatives prepared to meet for a new round of expected peace talks in Islamabad.

Speaking to Fox News Monday evening, White House Press Secretary Karoline Leavitt said the U.S. and Iran are on the "brink" of securing a deal, though she did not provide any insight into the state of potential peace talks.

"The United States of America tonight have never been so close to making a truly good deal," she said.

This comes despite Speaker of the Iranian Parliament Mohammad Bagher Ghalibaf issuing a new statement Monday: "We do not accept negotiations under the shadow of threats, and in the past two weeks, we have prepared to reveal new cards on the battlefield."

Leavitt also praised President Donald Trump's "hard-line negotiating style," something she has previously credited for bringing Iran to the table.

"Thanks to the success of the military operation and his hard-line negotiating style, we are on the brink of a deal. If not, the president as commander in chief still has a number of options at his disposal he is not afraid to use, President Trump has proven before he does not bluff," Leavitt said.

-ABC News' Emily Chang