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

By Steve Holland, Matt Spetalnick and Jonathan Landay WASHINGTON (Reuters) -U.S. President Donald Trump accused former President Barack Obama of "treason" on Tuesday, accusing him, without providing evidence,

Former President Barack Obama called a Russian collusion intelligence report genuine after President Donald Trump earlier on Tuesday accused Obama of treason.

President Donald Trump rehashed longstanding grievances over the Russia investigation that shadowed much of his first term, lashing out Tuesday following a new report from his intelligence director aimed at casting doubt on long-established findings about Moscow's interference in the 2016 election.

One day after President Donald Trump accused former President Barack Obama of treason over the intelligence assessment that Russia interfered in the 2016 election and sought to help Trump, Director of National Intelligence Tulsi Gabbard declassified a highly sensitive congressional report she claimed was more evidence of a “treasonous conspiracy.

Russian and Ukrainian negotiators met in Istanbul on Wednesday for their first peace talks in more than seven weeks, with Moscow under pressure from U.S. President Donald Trump to strike a deal or face tough new sanctions.

Republican leaders said they were ready to vote as soon as this month on punishing penalties against Moscow but have paused after President Trump threatened to act unilaterally within weeks.