Michigan Gov. Gretchen Whitmer (D) addresses the state during a speech in Lansing, Mich., on Friday. (AP)

President Trump said on Sunday that the federal government is stepping up efforts to obtain vital supplies for coronavirus testing, hours after several governors from both parties faulted his administration for not doing enough to help states.

Public health experts say testing on a larger scale is a crucial step before resuming normal social and economic activity in the country. But Trump defended the administration’s approach of leaving testing largely to states.