Republicans' lock on power in Washington next year will allow President-elect Donald Trump to pursue an aggressive agenda of tax cuts for businesses, workers and retirees that will test his party's often-aired goal of reining in the government's $35 trillion in debt.

The Republican sweep of the presidency and Congress has transformed what could have been a struggle to merely renew Donald Trump’s tax cuts into a multi-pronged campaign to slash levies in new and bigger ways.