Democrats are resisting President Donald Trump’s push to add Iran to a bipartisan Russia sanctions bill, complicating what had appeared to be an easy Senate victory before lawmakers leave Washington for their summer recess.

The GOP-led Senate could advance the long-stalled Russia sanctions package as early as this week in honor of the proposal’s lead Republican sponsor, the late Sen. Lindsey Graham. But Republicans are increasingly embracing Trump’s call to include Iran, while Democrats insist the two issues remain separate, raising questions about whether lawmakers can pass the bill before the August recess.