Former CIA Director John Brennan John Owen BrennanJournalism or partisanship? The media's mistakes of 2016 continue in 2020 Comey on Clinton tweet: 'I regret only being involved in the 2016 election' Ex-CIA Director Brennan questioned for 8 hours in Durham review of Russia probe MORE lit into President Trump Donald John TrumpUS reimposes UN sanctions on Iran amid increasing tensions Jeff Flake: Republicans 'should hold the same position' on SCOTUS vacancy as 2016 Trump supporters chant 'Fill that seat' at North Carolina rally MORE for his tweets about the investigation into Russia's election interference, saying Trump’s “insecurity is well deserved, as is your concern over Russia investigation.”

“It never ceases to amaze me how successful you have been making yourself so small, petty, and banal with your tweets. Your insecurity is well deserved, as is your concern over Russia investigation,” Brennan tweeted on Tuesday.

“Thomas Paine was right when he said, ‘These are the times that try men's souls,’” he added.

It never ceases to amaze me how successful you have been making yourself so small, petty, and banal with your tweets. Your insecurity is well deserved, as is your concern over Russia investigation. Thomas Paine was right when he said, "These are the times that try men's souls." https://t.co/EfaDBlYejF — John O. Brennan (@JohnBrennan) February 20, 2018

Brennan was directly replying to a tweet in which Trump claimed that he has “been much tougher on Russia” than former President Obama. Brennan was appointed by Obama.

Trump has been tweeting about the probes into Russia's election interference since special counsel Robert Mueller Robert (Bob) MuellerCNN's Toobin warns McCabe is in 'perilous condition' with emboldened Trump CNN anchor rips Trump over Stone while evoking Clinton-Lynch tarmac meeting The Hill's 12:30 Report: New Hampshire fallout MORE indicted 13 Russian individuals and three groups on Friday for charges related to meddling in the 2016 election.

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He sent out a series of tweets over the weekend about the probes, questioning why Obama hadn’t done more to address the Russian election interference.

Obama implemented new sanctions against Russia related to its meddling after the election.

Some Democrats have acknowledged that the Obama administration could have done more to address the election interference, but have criticized Trump for not implementing new Russian sanctions authorized by a bipartisan bill passed last year.