Former CIA director John Brennan had a fraught relationship with US President Donald Trump, and now he remains one of Trump's sharpest critics.<br />In his new memoir, 'Undaunted, Brennan told Business Insider what he feels is the biggest threat to the November election: President Trump himself.<br />Brennan says the Trump administration and campaign's 'dishonesty' and disinformation is just as dangerous as foreign interference in the election.<br />He added that Trump's refusal to acknowledge Russia's interference in the 2016 election would become one of the defining failures of his presidency.<br />On the other hand, Brennan said Russia has gotten everything it could have hoped for from the Trump presidency.
