The GOP's ObamaCare replacement plan will let people purchase health insurance across state lines, President Trump said Tuesday.

"Don't worry, getting rid of state lines, which will promote competition, will be in phase 2 & 3 of healthcare rollout. @foxandfriends," Trump wrote on Twitter.

The president added that he was working on a plan to drive down drug prices by increasing competition between pharmaceutical companies.

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"I am working on a new system where there will be competition in the Drug Industry. Pricing for the American people will come way down!" he tweeted.

Don't worry, getting rid of state lines, which will promote competition, will be in phase 2 & 3 of healthcare rollout. @foxandfriends — Donald J. Trump (@realDonaldTrump) March 7, 2017

I am working on a new system where there will be competition in the Drug Industry. Pricing for the American people will come way down! — Donald J. Trump (@realDonaldTrump) March 7, 2017

House Republicans on Monday unveiled their long-awaited measure to repeal and replace former President Barack Obama Barack Hussein ObamaGOP senator blocks Schumer resolution aimed at Biden probe as tensions run high D-Day for Trump: September 29 Obama says making a voting plan is part of 'how to quarantine successfully' MORE's signature healthcare law.

The House's proposal does away with ObamaCare's mandate that most Americans purchase health insurance, replacing it instead with a tax credit.

It also allows individuals to remain on their parents' health insurance plan until age 26.