WASHINGTON—The White House has delayed its plan to impose new financial sanctions on Iran for its ballistic missile program, according to U.S. officials, amid growing tensions with Iran over the nuclear deal struck earlier this year.

The officials said the Obama administration remains committed to combating Iran’s missile program and that sanctions being developed by the U.S. Treasury Department remain on the table. They also said imposing such penalties was legal under the landmark nuclear agreement forged between global powers and Iran in July.

U.S. officials offered no definitive timeline for when the sanctions would be imposed after the decision was made Wednesday to delay them. At one point, they were scheduled to be announced Wednesday morning in Washington, according to a notification the White House sent to Congress.

Republican leaders on Thursday accused the Obama administration of losing its will to challenge Iran after Tehran countered on Thursday that it would accelerate the development of its arsenal.

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