WASHINGTON — A divided White House staff, anxious corporate executives, lawmakers and foreign leaders are fiercely competing for President Trump’s ear this week as he nears a decision on whether to pull the United States out of the Paris climate accord, the landmark agreement that commits nearly every country to combat global warming.

For a president not steeped in policy intricacies, the decision is vexing. On both sides are voices he profoundly respects: chief executives of some of the world’s largest companies urging him to remain part of the accord and ardent conservatives like Stephen K. Bannon, his chief strategist, and Scott Pruitt, his Environmental Protection Agency administrator, tugging him toward a withdrawal from the 195-country agreement.

Exxon Mobil’s chief executive, Darren W. Woods, wrote recently that remaining in the agreement would be prudent, part of a nearly united corporate front. Within the administration, Gary D. Cohn, the director of the National Economic Council; the president’s daughter Ivanka Trump; and his secretary of state, Rex W. Tillerson, say the United States can remain a party to the accord even as the administration moves to eviscerate the Obama-era climate policies that would have allowed the United States to meet its pollution-reduction targets under the agreement.

In a major climate speech Tuesday, the United Nations secretary general, António Guterres, exhorted world leaders to stick to their commitments to the accord, calling for “increased ambition” in the face of threats to disengage.