"Inter agency, the entire US government has been having very robust and very vigorous conversations on this," Trudeau told the daily State Department press briefing. "[The issue] raises a lot of very strong viewpoints. The conversation is very vigorous."
Also on Thursday, US Secretary of State John Kerry flew to Moscow for talks with Russian President Vladimir Putin and Foreign Minister Sergei Lavrov on resuscitating the national ceasefire in Syria and advancing the peace process to end the civil war there.
Earlier in the day, the White House declined to publicly support or endorse the reported proposals, and Trudeau also refused to confirm whether President Barack Obama publicly and personally backed them.
"I can't speak to any specifics of any documents that may have been leaked," Trudeau stated.
US media reports have noted that anti-Russian hawks in the Obama administration, including Defense Secretary Ashton Carter, have opposed Kerry’s initiative.
Kerry is also believed to face opposition from hawks within the State Department such as Assistant Secretary of State for European Affairs Victoria Nuland.
