What Congress has yet to do, despite having Republican control

President Donald Trump's big announcements last week on health care and Iran have big implications, which Congress will largely have to sort out, adding major items to its already massive to-do list.

With only 38 working days left for this year, here's what Capitol Hill is trying to accomplish:

Tax overhaul

Having failed to repeal and replace the Affordable Care Act, Republicans' next best chance to notch a win before the 2018 midterm elections is overhauling the tax code, which Republicans want to achieve by lowering overall rates and preserving popular tax deductions. During a Sunday TV show appearance, Sen. Lindsey Graham, R-S.C., summed up the political necessity of enacting a tax overhaul, saying "If we don't, we're dead." The Senate is voting this week on a budget that will set the groundwork for that chamber to pass a tax plan with a simple majority - needing at least 51 votes rather than the usual 60.

Iran

With his announcement last week that he was "decertifying" the Iran nuclear deal, Trump punted the next step to Congress, which can choose to do nothing, to reimpose the nuclear sanctions that were lifted as part of the agreement or to figure out something else in between. There is a growing consensus that Iran should receive additional penalties for its ballistic missile program, which the nuclear deal does not address, and the Trump administration has expressed openness to changing a law requiring the president to affirm every 90 days that the deal is in the national interest of the U.S. - which is what set off this entire domino effect. But the congressional agenda didn't include Iran before this announcement, so it's not clear what appetite Republican leaders have to add it.

Health care

As with Iran, Trump's Friday announcement that he was cutting off the monthly payments to insurers to help them cover low-income people - known as CSRs - puts the burden on Congress to manage the fallout. Democrats and many moderate Republicans opposed the move, including Sen. Susan Collins, R-Maine, who appeared on ABC's "This Week" to express her concern. "I'm very disappointed in the president's actions of this past week," she said of his cutting off CSR payments and issuing executive orders that she said undermine the ACA. Members of both parties support passing a law to appropriate the CSR money to insurance companies, and Senate Health, Education, Labor and Pensions Committee Chairman Lamar Alexander, R-Tenn., is working with ranking member Sen. Patty Murray, D-Wash., on a compromise to do that. But Trump spoke with Alexander over the weekend, so the big question is how his involvement affects their negotiations.

Protections for Dreamers

Trump also added to Congress' long to-do list in early September when he announced he would end the Deferred Action for Childhood Arrivals (DACA) program, which protects the children of unauthorized immigrants from deportation. The administration said that DACA enrollees whose legal status expires before March 5 could apply for a two-year extension but that the program would cease to exist after that. Members of Congress have long expressed a desire to find a permanent legislative solution to the status of the 800,000-some unauthorized residents who arrived in the U.S. as children, known as Dreamers, but before now, leadership has not given it priority. Since Trump's announcement, House Speaker Paul Ryan of Wisconsin has expressed a desire for Congress to act and asked key members to start meeting as a working group on the issue. But Trump has sent confusing messages, telling Democratic leaders Rep. Nancy Pelosi of California and Sen. Chuck Schumer of New York that he would agree to exclude wall funding from a DACA deal and leading them to believe he would discuss a pathway to citizenship, then going back on that suggestion. "We're not looking at citizenship. We're not looking at amnesty," the president said on Sept. 14. "We're not talking about amnesty."

Fund the government

Around the same time he dined with Pelosi and Schumer to discuss DACA, Trump agreed, after a separate meeting with them, to a three-month extension of government funding and raising the debt ceiling for an equal period, tacking those on to Hurricane Harvey relief funds. The extensions run out in early December, so Congress must pass another funding bill on top of the policy priorities that members want to make progress on before they have to start seriously campaigning.

While Democrats had said they would use the concurrent debt ceiling and government funding deadlines to extract more funding concessions, Senate Majority Leader Mitch McConnell of Kentucky said he expected the Treasury to be able to use "extraordinary measures" to postpone a debt ceiling increase until well after December, meaning Democrats would no longer have the leverage that their debt ceiling votes would have afforded them.