U.S. President Donald Trump accused former President Barack Obama of "treason" on Tuesday, accusing him, without providing evidence, of leading an effort to falsely tie him to Russia and undermine his 2016 presidential campaign.

Besides Obama, President Trump on Tuesday rattled off a list of people he accused of acting criminally "at the highest level."

A spokesman for former President Barack Obama issued on Tuesday a rare rebuke of President Trump, calling Mr. Trump’s pledge to use the Justice Department to go after his predecessor for treason “ridiculous and a weak attempt at distraction.

The long-range Russian drones come in swarms each night, buzzing over Ukraine by the hundreds, terrorizing the population and attacking targets from the industrial east to areas near its western border with Poland.

The major aerial attack in the capital killed two people and wounded 15, including a 12-year-old, Ukrainian President Volodymyr Zelensky said.

Russian forces launched 42 Shahed-type attack drones and other drones overnight, primarily from Russia and occupied Crimea, Ukraine's Air Force said. At least 26 drones were shot down, and seven more were lost or suppressed by electronic warfare systems,