The Midterms Are Coming. Wall Street Sees A Debt-Ceiling Battle In The Future.

Wall Street is turning its attention to the November midterm elections as Democrats gain an edge in the battle for the House, raising the possibility that President Donald Trump could spend the final two years of his term dealing with a divided Congress.

Democrats lead Republicans by roughly six percentage points on the generic congressional ballot, while election forecasts generally give the party a better chance of taking the House than the Senate. With the election about 10 weeks away, investors are increasingly considering what a shift in congressional power could mean for stocks, bonds and fiscal policy.

Analysts told CNBC that investors are watching three major risks: more aggressive executive action from Trump if Democrats gain power, a potentially bruising debt-ceiling fight in 2027 and market volatility if close races leave control of Congress undecided after Election Day.

Divided government has often been viewed favorably by markets because it makes sweeping legislative changes harder to enact. JPMorgan noted in a June report that the S&P 500 has historically performed better under divided government than single-party control dating back to 1950. Even if Democrats capture both chambers, Trump could block major Democratic tax, climate or health-care legislation with his veto.

The legislative stalemate, however, would not necessarily mean less policy activity. Raymond James Washington policy strategist Ed Mills told the outlet that many of the biggest market-moving decisions during Trump's second term have come through executive action. He said a Democratic House majority could make Trump more likely to pursue policy through presidential powers rather than seek compromises with lawmakers.

Trump's tariff campaign has demonstrated how executive decisions can move markets. The president imposed sweeping tariffs using emergency powers before the Supreme Court ruled that the International Emergency Economic Powers Act did not give him that authority. Trump has since pursued tariffs through other legal mechanisms.

Another concern is the federal debt ceiling. Congress raised the borrowing limit by $5 trillion to $41.1 trillion in 2025, but financial institutions expect the government to reach the new ceiling around mid-2027. TD Securities expects lawmakers ultimately to raise or suspend it but warned negotiations under divided government could go down to the wire.

A prolonged fight could increase volatility and push up rates on Treasury bills maturing near the government's projected deadline, TD Securities strategist Molly Brooks told CNBC. The scenario would resemble 2023, when House Republicans demanded spending cuts from the Biden administration in return for supporting a debt-ceiling increase, bringing Washington close to default.

Markets are also preparing for the possibility that control of Congress will not be known immediately. Closely contested House races, including several in California where ballots can take longer to count, could delay a final result.

The political environment currently favors Democrats on some of voters' biggest concerns. A Reuters/Ipsos poll released Tuesday found Americans preferred Democrats over Republicans on handling the cost of living by 36% to 28%, while Trump's approval rating stood at 33%. All 435 House seats and 35 Senate seats will be contested on Nov. 3.