(Updates with agreement reached in Senate)
WASHINGTON, June 29 (Reuters) - The U.S. Senate reached an agreement on Thursday to resolve a technical issue stalling a new package of sanctions on Russia, although the measure's fate in the House of Representatives remained uncertain, lawmakers said.
The legislation passed the Senate by a nearly unanimous 98-2 margin on June 15, looking like it might complicate President Donald Trump's desire for warmer relations with Moscow, where officials have denounced new sanctions.
But it was blocked in the House, where Republican leaders said the Senate bill violated a constitutional requirement that any bill affecting government revenues originate in the House, something known as a "blue slip" violation.
Lawmakers from the two chambers have bickered about the issue since. Democrats accused House Republican leaders of trying to kill the bill to please Trump after administration officials said they had concerns about it.
Senator Ben Cardin, the top Democrat on the Senate Foreign Relations Committee, told reporters the "blue slip" issue had been fixed without any significant changes to the legislation.
"There's no substantive changes at all," he told reporters.
The Senate reached a "unanimous consent" agreement on Thursday that resolved the issue, sending it back to the House.
It was not immediately clear how the House, where Trump's fellow Republicans control a larger majority than in the Senate, would respond.
If passed in the House and signed into law by Trump, the measure would put into law sanctions previously established via Democratic former President Barack Obama's executive orders, including some on Russian energy projects. The legislation also allows new sanctions on Russian mining, metals, shipping and railways and targets Russians deemed responsible for conducting cyber attacks or supplying weapons to Syria's government.
It also sets up a review process that would require Trump to get Congress' approval before taking any action to ease, suspend or lift any existing sanctions on Russia.
Asked about the bill at his weekly news conference on Thursday, House Speaker Paul Ryan said he would wait for the Senate to resolve the procedural issue.
"They wrote the bill incorrectly so we've told the Senate you have to write it correctly to follow the Constitution," Ryan said.
Trump will meet with Russian President Vladimir Putin at the Group of 20 summit in Germany next week. (Reporting by Patricia Zengerle; Additional reporting by Amanda Becker; Editing by Jeffrey Benkoe and Frances Kerry)