The Democrats indicated that they would forgo another possible article under discussion in recent weeks that would have charged Mr. Trump with obstruction of justice based on his attempts to thwart Robert S. Mueller III’s investigation into his campaign’s ties to Russian election interference in 2016. That decision reflected a calculated move by Democrats to push forward with a narrow case against Mr. Trump based on his dealings with Ukraine, after some of their moderate lawmakers in conservative-leaning districts signaled they would not support a broader set of charges.
Though the details differ substantially, the articles of impeachment Democrats outlined on Tuesday echo those the Judiciary Committee approved in 1974 charging President Richard M. Nixon with abuse of power, obstruction of justice and contempt of Congress. Mr. Nixon resigned before the full House had a chance to vote on the articles, amid clear indications that the charges had broad support from members of both parties.
There is less overlap with the other modern presidential impeachment. In 1998, the House approved impeachment articles charging President Bill Clinton with perjury and obstruction of justice. Two other counts, of perjury and abuse of power, failed in votes on the House floor. It was that kind of split decision that Democratic leaders are determined to avoid this time around.
With all but a handful of House Republicans firmly united behind Mr. Trump, the charges Democrats have settled on are all but certain to face monolithic Republican opposition. If that does not change, and Mr. Trump continues a defiant defense, the impeachment vote against him could take place strictly along party lines, save for one independent, Representative Justin Amash of Michigan, who has signaled he will join Democrats.
The impeachment effort would also face an uphill battle in the Republican-controlled Senate, where it would take the support of two-thirds of the chamber to convict Mr. Trump and remove him from office — a highly unlikely scenario, particularly in an election year.
A little more than an hour before Democrats’ announcement, Mr. Trump declared on Twitter that it was “sheer Political Madness” to impeach a president who has done “NOTHING wrong” and overseen “perhaps the strongest economy in our country’s history.”