Uncle Sam doesn’t have a credit limit: Uncle Sam has chosen to take on debt so rich people can avoid paying taxes. If we had rich people pay at the same rates they paid a few decades ago, didn’t have caps on the maximum amount of taxable income for social security, etc. we could return to the balanced budget we had at the turn of the century before the Republicans lowered taxes for the express political goal of forcing program cuts.
How about Uncle Sam starts taking money back from rich people instead of foisting more debt on workers and slashing my benefits so that they can buy another yacht?