Charles and David Koch's political network will spearhead a multimillion-dollar campaign to tout the recently passed Republican-backed tax plan in 2018.

The campaign will be made up of television, radio and digital advertisements in addition to door knocking, workshops, phone banking and various events, according to BuzzFeed News.

The effort comes as Republicans and Democrats gear up for the 2018 midterm elections, in which the tax plan is likely to be a hot-button issue.

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A spokesman for the Koch network told BuzzFeed that the political group had not decided on how much to spend on the effort.

"It is hard to project a precise figure," James Davis said. "It depends on what is needed to make a strong impact and connect Americans to it."

Davis went on to say Americans still need to be informed about the benefits of the plan.

"Given that the tax reform bill was just finalized, there’s a lot of work to be done educating Americans about its benefits," Davis said. "We will make a massive push to show how pro-growth policies can revitalize the economy and open the floodgates to new opportunity, innovation and prosperity. There’s no doubt this was an historic achievement, but it was only the first step."

News of the effort comes a day after the House gave the final green light on the legislation on Wednesday, sending the bill to President Trump Donald John TrumpBiden on Trump's refusal to commit to peaceful transfer of power: 'What country are we in?' Romney: 'Unthinkable and unacceptable' to not commit to peaceful transition of power Two Louisville police officers shot amid Breonna Taylor grand jury protests MORE's desk.

The legislation, which marks a major legislative victory for Trump and congressional Republicans, would cut taxes and repeal the ObamaCare individual mandate.

Polls show the plan is deeply unpopular with the American public.

An NBC News/Wall Street Journal poll released on Tuesday found that only 24 percent of Americans polled said they believed the plan was a good idea, while 41 percent said it was a bad idea.