But for President Trump, Ukraine has been an obsession since the 2016 campaign.
Long before the July 25 call with the new Ukrainian president that helped spur the formal start of impeachment proceedings against him in the House, Mr. Trump fretted and fulminated about the former Soviet state, angry over what he sees as Ukraine’s role in the origins of the investigations into Russian influence on his 2016 campaign.
His fixation was only intensified by his hope that he could employ the Ukrainian government to undermine his most prominent potential Democratic rival in 2020, former Vice President Joseph R. Biden Jr.
His personal lawyer, Rudolph W. Giuliani, has undertaken a nearly yearlong, free-ranging effort to unearth information helpful to Mr. Trump and harmful to Mr. Biden.
And Mr. Trump has put the powers of his office behind his agenda: He has dispatched Vice President Mike Pence and top administration officials with thinly veiled messages about heeding his demands about confronting corruption, which Ukrainian and former American officials say is understood as code for the Bidens and Ukrainians who released damaging information about the Trump campaign in 2016. This summer he froze a package of military assistance to Ukraine even as the country, eager to build closer relations with Washington, continued to be menaced by its aggressive neighbor Russia.
When Ukraine elected its new leader, Volodymyr Zelensky, on April 21, Mr. Trump seized on the moment as an opportunity to press his case. Within hours of Mr. Zelensky’s victory, Mr. Trump placed a congratulatory call as he was en route from his Mar-a-Lago resort in Florida to Washington.
He urged Mr. Zelensky to coordinate with Mr. Giuliani and to pursue investigations of “corruption,” according to people familiar with the call, the details of which have not previously been reported.
Four days after this first call, Mr. Trump said on Sean Hannity’s Fox News program that he “would imagine” that Attorney General William P. Barr would like to review information about Ukraine’s actions in the 2016 election.