Republicans are gaining on their Democratic counterparts in the generic House ballot, a new poll published Wednesday found.

Democrats maintain a lead over the GOP on the generic ballot, with 47 percent of registered voters saying they’d support Democratic candidates over Republicans if the election were held today. Forty-five percent of voters would support GOP candidates, according to a Monmouth University Poll.

That latest figures for the generic ballot are a marked shift from December, when 51 percent of voters said they would back Democrats, compared to 36 percent who would cast ballots for Republican congressional candidates.

“The generic Congressional ballot is prone to bouncing around for a bit until the campaign really gets underway later this year,” Patrick Murray, director of the Monmouth University Polling Institute, said. “But Democrats who counted on riding public hostility toward the tax bill to retake the House may have to rethink that strategy.”

Republicans are eager to tout the benefits of their tax bill, which was passed by Congress and signed into law by President Trump last month. But Democrats argued the legislation would benefit wealthy Americans and big corporations.

Since the passage of the tax bill, though, a number of major companies have announced new benefits for employees, including bonuses of up to $1,000 and increases to their respective minimum wages, which they attributed specifically to the GOP’s tax reform.

The Monmouth University Poll of 806 adults was conducted from Jan. 23 to Jan. 30 with a margin of error of plus or minus 3.5 percentage points.