The vote could be a moment of truth for several Democratic presidential candidates.
Even without McConnell's efforts, the Green New Deal has become the latest flashpoint in the Democratic party's internal conflict between its centrists and its unapologetic left wing.
The climate measure is already supported by at least five senators seeking the Democratic nomination for president: Cory Booker of New Jersey, Kirsten Gillibrand of New York, Kamala Harris of California, Elizabeth Warren of MA and Amy Klobuchar of Minnesota.
"Don't let Mitch McConnell fool you: this is nothing but an attempt to sabotage the movement we are building".
The legislation, a sweeping package of climate-change measures unveiled by Representative Alexandria Ocasio-Cortez of NY, has drawn a tepid response from House Speaker Nancy Pelosi, who didn't explicitly throw her support behind the ideas. Bernie Sanders of Vermont, though technically an independent, has also said that he might run for president in 2020. The ambitious proposal has been spearheaded by Congresswoman Alexandria Ocasio-Cortez.
The Senate vote is not yet scheduled, and a spokesman for McConnell said that the Republican leader's office doesn't expect it to come this week. However, it's received far less support and more pause from moderate Democrats while receiving criticism from Republicans.
"I really don't like their policy of taking away your vehicle, of taking away your airplane rights, of 'Let's hop a train to California, ' of you're not allowed to own cows anymore", Trump told the crowd. House Speaker Nancy Pelosi derisively referred to the House version of the bill as a "green dream", while only 11 of the 47 senators who caucus with the Democrats have signed on to sponsor the bill.
The vote on the health care legislation didn't quite carry the punch Republicans had hoped.
"To me, this is just so extreme", said John Barrasso of Wyoming.