Washington, London- US President Donald Trump has accused former president Barack Obama of wire-tapping his office telephones during last year’s election, without offering any evidence or explanation.

In a series of tweets, Trump described Obama as a “bad (or sick) guy.” He also tweeted: “Terrible! Just found out Obama had my wires tapped in Trump Tower just before the victory. Nothing found.”

Obama’s spokesman Kevin Lewis said a “cardinal rule of the Obama administration was that no White House official ever interfered in any Justice Department investigations.”

“As part of that practice, neither President Obama nor any White House official ever ordered surveillance on any US citizen. Any suggestion otherwise is simply false,” Lewis said.

Trump’s tweets were not restricted to Obama wiretapping but also included Russian Ambassador Sergey Kislyak who had visited the White House 22 times during Obama’s tenure, four times last year.

He concluded his tweets with a sarcastic offense on Arnold Schwarzenegger saying, “Arnold Schwarzenegger isn’t voluntarily leaving the Apprentice, and he was fired by his bad (pathetic) ratings, not by me. Sad end to great show”.

Trump’s accusation coincides with tough political situation he is going through. Six months after his victory, Trump faces accusations that his team has contacted Russian officials during the campaign and the transitional period.

Washington Post newspaper revealed this week that Kislyak has met several consultants of Trump before and after the elections. Washington actually accused Russian President Vladimir Putin of seeking to influence the outcomes of the presidential elections in favor of Trump – In December, Obama imposed sanctions on Moscow.

Trump, however, rejected any accusation of him trying to strengthen ties with Moscow and held the Democrats responsible for the campaign held against him.