WASHINGTON (AP) — Republicans in the Senate appear unmoved by the Democratic push for witnesses in President Donald Trump's impeachment trial despite persistent appeals from Rep. Adam Schiff and the other House prosecutors.

Over three days of arguments, Democrats warned that the senators will live to regret not delving deeper into Trump's dealings with Ukraine. One of the managers, House Judiciary Committee Chairman Jerrold Nadler, even told them it was "treacherous" to vote against gathering more evidence.

Yet there's no indication the Democrats are moving closer to persuading four Republican...