The Tax Plan will pay for itself.

That is an outright falsehood.

"Joint Committee on Taxation (JCT), Congress's nonpartisan scorekeeper, predicted that the Senate tax bill would add about 0.1 percent more a year to growth over the next decade, far less than what Treasury says. JCT took into account the economic effects of the tax cuts on individual and business taxes, but not other policy changes advocated by the administration, such as welfare reform. The JCT says the Senate bill's total cost would be $1 trillion after considering growth effects.

https://www.washingtonpost.com/news/wonk/wp/2017/12/11/the-t...

http://thehill.com/policy/finance/364415-wharton-study-gop-t...