WASHINGTON — Shortly after Thursday’s appeals court decision blocking his travel ban, President Trump vowed to fight on. “SEE YOU IN COURT,” he wrote on Twitter.

But which court?

Here is a look at Mr. Trump’s options.

Two roads to the Supreme Court

Mr. Trump could file an emergency application to the Supreme Court, asking the justices to stay the trial court’s ruling blocking his executive order suspending travel from seven mostly Muslim countries. That is the only way for him to try to obtain a very fast ruling. Since Mr. Trump has said the court rulings against his travel ban pose an immediate threat to the nation’s security, he might be expected to pursue this strategy.

If he does, the Supreme Court could act within days. Under its usual practices, it would not hear arguments and would issue a very brief order announcing the outcome with little or no legal reasoning.

Richard J. Lazarus, a law professor at Harvard, said the justices should take a different approach in this case if the administration files an emergency application, recalling that the court heard arguments in very short order when the Nixon administration in 1971 unsuccessfully sought to block The New York Times and The Washington Post from publishing a secret history of the Vietnam War.