US President Donald Trump on Sunday urged Republicans to expand a proposed Senate sanctions bill against Russia by including Iran, saying the move had been supported by the late Senator Lindsey Graham and should now be carried forward.

"Republicans should add Iran to the Russian Sanctions Bill. That's what Lindsey wanted to do, and it was going to happen. Important!!!" Trump wrote in a post on Truth Social.

Trump's call marks his latest push for tougher action against Tehran, coming shortly after he dismissed Iran's reported decision to stop abiding by the US-Iran memorandum of understanding (MoU).

"I couldn't care less," Trump said, reiterating that the United States' priority remained preventing Iran from acquiring a nuclear weapon.

The President's remarks put fresh focus on the Senator Lindsey O. Graham Sanctioning Russia Act of 2026, a bipartisan bill introduced in the Senate last week to tighten economic pressure on Moscow over its war in Ukraine. While the legislation primarily targets Russia and countries supporting its energy exports, Trump is now urging lawmakers to widen its scope by bringing Iran under its provisions.

Introduced by Senators Jeanne Shaheen, Richard Blumenthal and Darline Graham, the revised legislation reflects changes that its sponsors said were agreed with the White House before Lindsey Graham's death.

The updated bill replaces an earlier proposal for a blanket 500 per cent tariff with targeted tariffs of up to 100 per cent on the world's five largest purchasers of Russian crude oil and natural gas. It also exempts countries importing less than 15 per cent of Russia's natural gas exports if they are taking significant steps to reduce those imports.

The legislation further authorises tariffs of up to 100 per cent on countries accused of helping Russia evade oil sanctions, incorporates the bipartisan SHADOW Fleet Sanctions Act targeting vessels used to bypass sanctions, strengthens waiver requirements, and includes provisions from the STOP Russia-China Act aimed at curbing Chinese support for Russia's defence industrial base.

According to the bill's sponsors, Lindsey Graham met Ukrainian President Volodymyr Zelenskyy shortly before his death and secured White House backing for the revised draft. Graham and Blumenthal had first introduced the sanctions proposal in April 2025.

Trump had backed the Russia sanctions legislation earlier this year because of its focus on countries buying Russian oil.

With ANI inputs