WASHINGTON (AP) — The standoff over President Donald Trump's impeachment trial deepened Wednesday as Senate Majority Leader Mitch McConnell said there will be "no haggling" with Democrats as House Speaker Nancy Pelosi demands for more details and witnesses.

McConnell's Senate majority has the leverage Republicans need to launch Trump's trial toward swift acquittal of the charges, but Pelosi's reluctance to transmit the articles of impeachment leaves the proceedings at a standstill.

What started as a seemingly minor delay over process and procedures is now a high-stakes showdown between two ski...