A day after Trump’s abortion statement, Arizona awaits a key ruling.

A day after former President Donald J. Trump dominated headlines with a statement declaring that abortion policies should be left to the states, the issue will continue to be at the forefront of the nation’s political conversation.

On Tuesday, the Arizona Supreme Court will announce a decision in what could be a landmark case on abortion rights in that state. It will either uphold the state’s current 15-week ban, or revert to an 1864 law that would ban nearly all abortions.

The ruling could have a significant impact on elections in a battleground state. Supporters of a ballot measure on abortion are likely to succeed in putting to voters a proposed constitutional amendment that would enshrine the right to an abortion before viability, or at about 24 weeks. Democrats are counting on the measure to give them an advantage in November’s elections.

Mr. Trump’s announcement on Monday came after months of mixed signals on abortion and remained low on specifics — for example, he skirted the question of whether he would sign a federal abortion ban if he was elected to a second term. And while he asserted that Republicans were “now free” to focus on more politically favorable issues, his statement revealed fault lines within his party and provoked attacks from President Biden and other Democrats.

He had suggested that he would back a 15-week federal ban on abortion, and Republicans who support a national ban seized on the seeming reversal. Former Vice President Mike Pence called the statement a “slap in the face.” Marjorie Dannenfelser, the president of the leading anti-abortion group Susan B. Anthony Pro-Life America, said she was “deeply disappointed.” And Senator Lindsey Graham said that he disagreed with Mr. Trump, and that he