The United States has said that Iran’s nuclear program, as well as its ballistic missiles and naval forces, pose a serious security threat.

Secretary of State Marco Rubio, who is also Trump’s top national security adviser, said that “Iran, which has long been a threat to the United States, remains a concern.”

Iran, which has held three rounds of talks with the United States on its nuclear program, has repeatedly denied that its nuclear program is for peaceful purposes.

Iran, which was attacked by the United States and Israel in June, “was told not to rebuild its nuclear facilities after they were destroyed. But it is clear that they are still trying to rebuild them,” Rubio said. “They are not enriching uranium right now, but they are working to get there.”

In addition to its nuclear program, Iran has a number of long-range missiles that pose a serious threat to the United States and its allies, he added.

Iran’s ballistic missile program, especially the short-range ones, “is designed to target U.S. allies and military bases in the region,” he said.

The United States has close allies in Iran, including the United Arab Emirates, Qatar, and Bahrain, where it has military bases. Rubio also said Iran’s naval capabilities are a concern, saying they “could target commercial shipping and U.S. Navy personnel.”

Iran has shown no interest in negotiating with the United States or any other party on its missiles outside of its nuclear program, calling it a “major problem.”

"Regarding the negotiations between his country and Iran, President Trump has indicated that he wants a diplomatic solution, but that other options are open if talks fail."