Republican presidential candidate Donald Trump said Tuesday that as president he would spend at least twice as much money on infrastructure projects as Hillary Clinton has proposed – and rack up new debt to do it.

Clinton unveiled a plan last November to commit a total of $500 billion in government money to rebuild bridges, roads, tunnels, dams and other critical infrastructure elements.

BIG SPENDER: Donald Trump said Tuesday on the Fox Business Network that he would at least double Hillary Clinton's planned spending on infrastructure projects

BUILDER: This Cleveland bridge project is slated to open later this year

That would include $250 billion in direct federal spending and $25 billion for a fund that would bring in another $225 billion in 'direct loans, loan guarantees, and other forms of credit enhancement.'

All of that would rack up new public debt, adding to what will likely be $21 trillion in debts by the time the next president takes office.

Trump told Fox Business Network host Stuart Varney on Tuesday morning that he would 'at least double' Clinton's numbers, 'and you're gonna really need more than that.'

And he said he would issue federal Treasury bonds to pay for it all.

'I don't know if you've seen the warning charts, but we have many, many bridges that are in danger of falling,' Trump warned.

'We're going to go out with a fund' to repair them, he said. 'We'll get a fund, make a phenomenal deal with the low interest rates and rebuild our infrastructure. We have no choice.'

Asked who would invest in the fund, Trump clarified that 'citizens would put money into the fund and we will rebuild our infrastructure with that fund and it will be a great investment, and it's going to put a lot of people to work.

'These would sold as bonds,' he added, 'so we'd do infrastructure bonds from the country, from the United States.

DEEP DIG: This Los Angeles tunnel is being redone after 100 years under a downtown street

He also promised to leverage his strengths as a builder to complete public works projects 'without cost overruns.'

'Nobody can build better than I can, and nobody can - you know, nobody knows construction - better than I can. I have great relationships with the people that are going to do the work.'

Trump has proclaimed himself 'the king of debt' in the past, citing a history of borrowing money to erect buildings and then refinancing those debts later at more favorable interest rates.

Bonds, however, are more challenging to refinance. Governments have to wait until short-term notes mature, buy back the debt, and then issue new bonds at lower interest rates.

That move usually involves swapping short-term debt for 30- or 50-year bonds.

Trump hasn't said whether he would issue such 'long' bonds to finance his infrastructure projects.