WASHINGTON (MarketWatch)—Elizabeth Warren is firing back a day after President Barack Obama called her “wrong” on trade policy.

The Massachusetts senator, a Democrat and a favorite of liberals, faulted the administration in a blog post on Wednesday for keeping Americans “in the dark” about a proposed trade agreement with Pacific nations.

“Have you seen what’s in the new [Trans-Pacific Partnership] trade deal?” Warren wrote. “Most likely, you haven’t—and don’t bother trying to Google it. The government doesn’t want you to read this massive new trade agreement. It’s top secret.”

Warren didn't mention fellow Democrat Obama by name. But the implication was clear.

In comments to MSNBC’s Chris Matthews on Tuesday, Obama said: “I love Elizabeth. We’re allies on a whole host of issues. But she’s wrong on this.”

Also read: Obama says Elizabeth Warren is ‘wrong’ about trade.

Warren and other Democrats, including Senate Minority Leader Harry Reid, have voiced strong opposition to Obama’s trade agenda, which includes the proposed Pacific trade deal and so-called “fast track” trade authority. Reid said Tuesday he wasn’t just a “no” on fast track, but a “hell no.” The authority would allow Congress an up-or-down vote on proposed trade agreements, but prevent lawmakers from amending them. The Obama administration has been pushing for fast track to speed passage of deals like TPP through Congress.

Obama argues that the Trans-Pacific Partnership, which is aimed at eliminating tariffs and other trade barriers among 12 nations, will benefit American workers and businesses.

But Warren and other critics, including labor unions, have charged the deal will mean lost American jobs and weakened environmental laws.

Warren wrote there shouldn’t be a fast track vote until Americans can examine the text of the Pacific deal now being negotiated by the administration. A Senate vote on fast track, however, could come within the next month, according to Senate Finance Committee Chairman Orrin Hatch.

The U.S. is negotiating the TPP with Australia, Brunei Darussalam, Canada, Chile, Japan, Malaysia, Mexico, New Zealand, Peru, Singapore and Vietnam.