How Congress Deals With This To-Do List Impacts Everything

As Congress returns today from a lengthy summer recess, it will be facing a raft of unfinished business and a much different political landscape than the one it left behind in late July.

In the lawmakers’ absence, multi-billionaire Donald Trump has emerged as the undisputed Republican presidential frontrunner with an anti- illegal immigrant, anti-Establishment, pro-war and pro-tax increase agenda that will both energize and further polarize the political debate on Capitol Hill.

Related: Billions in Unfinished Business as Congress Heads Out for Vacation

Democratic presidential frontrunner Hillary Rodham Clinton meanwhile is now trailing Sen. Bernie Sanders in New Hampshire. With a sizable majority of voters doubting her honesty, a House special committee hearing next month into the former secretary of state’s handling of the Benghazi controversy and her use of a personal email server for official business will take on added political significance as she tries to regain some momentum.

More on the follow-up list:

  • ISIS forces have grown stronger and more menacing in Syria and Iraq.

  • A humanitarian crisis of epic proportions is playing out in Europe as more than 800,000 immigrants are fleeing Syria and other war-torn areas of the Middle East.

  • The stock market has been rattled by growing concerns about China’s struggling economy.

  • President Obama has assembled enough Democratic support in the Senate to ensure his Iran deal and sustain a veto in the event the Republican-controlled Congress approves a motion of disapproval.

This fast-changing landscape is likely to jolt Congress out of its late-summer torpor and force Senate and House GOP leaders to alter their already formidable fall legislative game plan to adjust to the new political realities.

Related: Iran Nuclear Deal Looks Like a Lock as Mikulski Announces Her Support

One continuing reality from the old punch list is the possibility of a shutdown if Congress doesn’t pass a stop gap spending bill or “continuing resolution” to keep the government operating beyond the start of the new fiscal year, which begins October 1. And new debt ceiling legislation to avert a first-ever default on U.S. borrowing. Other important pending issues include new long-term spending authorization for highways, bridges and other infrastructure and the possible reauthorization of the U.S. Export-Import Bank

“It looks like a traffic jam on the runway,” said Ron Bonjean, a political analyst and former congressional Republican communications director. “There are a lot of legislative planes waiting to take off and get past, but it looks like it could get stalled over a number of issues – everything from Planned Parenthood to the highway bill to issues over the budget.”