President Donald Trump has signed his signature bill of tax and spending cuts at the White House Fourth of July picnic.

Congress passed a giant tax bill that includes the Senate's SALT changes that allow rich Americans in high-tax states to save money, experts say.

At its core, the bill permanently extends the tax cuts introduced in the 2017 Tax Cuts and Jobs Act while introducing a raft of new breaks. Some, such as an expanded child tax credit and an above-the-line deduction for charitable contributions, are permanent changes to the tax code.