WASHINGTON – Sen. Marco Rubio's move yesterday to increase the child tax credit by giving corporations less of a break has drawn powerful opposition.

"Florida's Republican tries to blow up the Senate tax reform," read a Wall Street Journal editorial on Wednesday evening, hours after Rubio and Sen. Mike Lee offered their proposal. (The White House had already come out in opposition to a corporate tax rate of 22 percent, up from 20 percent.)

"The GOP is pushing forward on tax reform, though a receiving line of Republican holdouts are slow-rolling progress," the editorial read. "One who deserves special mention is Marco Rubio, who contributed nothing to ObamaCare repeal and now aspires to dilute the tax bill. Voters ought to remember this when he's next pitching himself for President."

Worse, it said Rubio has adopted Chuck Schumer talking points by noting that businesses get 70 percent of the tax cuts under the plan, with individuals getting 30 percent. "This is a false choice—individuals earn income at businesses—and apes the left's class-war politics. "

Rubio pushed back on Twitter.

Americans for Tax Reform, Grover Norquist's group, on Thursday morning urged senators to defeat the Rubio-Lee amendment.

"Businesses don't pay taxes – people do, so any higher tax rate on businesses is passed onto employees, consumers, and investors," ATR said.

Even if Rubio fails, he's still likely to support the overall deal.