Kaine's resolution will get a vote on Wednesday. (Al Drago/Joe Raedle/Bloomberg via Getty Images)
"There may be a whole new series of trade or tariff-related motions coming your way soon," the Virginia Democrat said.
Kaine did note that "Canada and Mexico are not completely the same because of some of the issues with respect to fentanyl," so it's unclear whether he would seek to challenge the Mexico emergency specifically.
The Wednesday press conference was led by Senate Minority Leader Chuck Schumer, D-N.Y., to rail against Trump's Canadian tariffs.
"So we're going to fight these tariffs tooth and nail," he said. "Trump's done a lot of bad things. This is way up there."
The White House did not immediately provide comment to Fox News Digital.
TRUMP, SENATE GOP BUDGET LEADERS HUDDLE AT WHITE HOUSE ON RECONCILIATION BILL
Paul has been a vocal critic of tariffs. (Al Drago/Bloomberg via Getty Images)
Trump took to social media to call out those he suspected might vote against him. "Mitch McConnell of Kentucky, Susan Collins of Maine, Lisa Murkowski of Alaska, and Rand Paul, also of Kentucky, will hopefully get on the Republican bandwagon, for a change, and fight the Democrats wild and flagrant push to not penalize Canada for the sale, into our Country, of large amounts of Fentanyl, by Tariffing the value of this horrible and deadly drug in order to make it more costly to distribute and buy," he wrote on Truth Social.
Last month, Kaine similarly forced a vote to end Trump's emergency declaration to "unleash American energy" and increase oil drilling and production of natural gas.
The resolution was voted down, and the White House claimed Kaine wanted "to impoverish Americans."
"President Donald Trump’s executive order brings America into the future and unleashes prosperity. Senator [Tim] Kaine wants to cost the economy trillions and risk losing nearly a million jobs," deputy press secretary Anna Kelly said at the time.
DEMS MUM ON TRUMP'S COURT FIGHTS DESPITE TRYING TO LIMIT BIDEN-BLOCKING JUDGES
Kaine left the door open to more challenges. (J. Scott Applewhite/AP)
The White House has also warned of a likely veto if the Canadian tariff resolution is agreed to in the Senate.
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A White House official told Fox News Digital in an exclusive statement on Tuesday, "President Trump promised to secure our borders and stop the scourge of fentanyl that’s poisoning our communities, and he’s delivering. Democrat Senator Tim Kaine is trying to undermine the President’s Emergency Declaration at our Northern Borders – a measure that prioritizes our national security – for reasons that defy logic."
Julia Johnson is a politics writer for Fox News Digital and Fox Business, leading coverage of the U.S. Senate. She was previously a politics reporter at the Washington Examiner.
Follow Julia's reporting on X at @JuliaaJohnson_ and send tips to Julia.Johnson@fox.com.
https://www.foxnews.com/politics/senate-dems-foreshadow-more-forced-votes-block-trumps-emergency-orders