WASHINGTON — Congress returned Tuesday to deal with some unfinished business from 2015 and to forge a legislative agenda that could shape the 2016 presidential and congressional elections.

Here’s a look ahead.

Health care

The House of Representatives will vote on a measure this week to repeal the Affordable Care Act, President Obama’s legacy accomplishment.

The bill would strip key elements from the ACA, including the individual mandate to have insurance or pay a fine and the employer mandate to offer insurance. The measure also contains a provision to eliminate federal funding for Planned Parenthood, a goal of conservative Republicans after secretly recorded videos surfaced last year that reportedly showed an employee of the organization discussing the sale of fetal tissue.

This is the health care repeal bill that the Senate passed before adjourning for the holidays. If the bill clears the Republican-controlled House, it would be the first ACA repeal measure to reach Obama’s desk.

Obama would certainly veto it. Still, Republicans view getting it through both chambers of Congress as a symbolic victory they can take on the campaign trail.

Syrian refugees

Republicans intend to battle Obama’s plan to bring 10,000 Syrian refugees to the United States, fearing terrorists could enter the country through the resettlement program.

Senate Majority Leader Mitch McConnell, R-Ky., placed a House-passed bill on the Senate calendar that would restrict the flow of Syrian and Iraqi refugees. It was written by Rep. Richard Hudson, R-N.C., and House Homeland Security Committee Chairman Michael McCaul, R-Texas.

Senate Minority Leader Harry Reid, D-Nev., has signaled that the Hudson-McCaul bill isn’t going anywhere in the Senate.

This could present problems for House Speaker Paul Ryan, R-Wis. Several conservative Republicans expressed displeasure that the omnibus spending bill didn’t include measures to stall or prevent Obama’s plan.

The Islamic State

While the debate over Syrian and Iraqi refugees rages, Ryan said he’d like Congress to pass a war powers resolution against the Islamic State, commonly known as ISIS.

“It would be a good symbol of American resolve to … go after ISIS, to thoroughly defeat and destroy ISIS,” he said last month.

Depending on how such a resolution is crafted, lawmakers could find a receptive White House. Obama said in a televised speech last month, “If Congress believes, as I do, that we are at war with ISIL (another abbreviation for the Islamic State), it should go ahead and vote to authorize the continued use of military force against these terrorists.”

Gun control

President Obama and congressional Democrats are arguing for stricter gun control measures.

Obama intends to use executive action to place new curbs on guns, reportedly including requiring more gun sellers to conduct background checks.

Lawmakers and Republican presidential candidates are already accusing Obama of executive overreach. “Such an expansion of governmental power would represent an abuse of one of the core individual rights protected by our Bill of Rights,” Rep. Mark Sanford, R-S.C., said Monday.

Criminal justice overhaul

Obama wants it, the conservative Koch brothers want it, most of the 2016 presidential contenders want it, and the House and Senate have proposals to do it.

Revamping the nation’s criminal justice system may be one of the few areas where political parties and differing ideologies find common ground.

Senate Democrats have concerns about a House overhaul bill that they contend would make it more difficult to sue corporations. The Senate criminal justice bill made it through the Judiciary Committee in October with provisions that limit mandatory minimum sentences for nonviolent offenders and give judges more leeway in some sentences. Four Republicans on the committee voted against it.