Republicans in the U.S. Congress turned in earnest on Monday to their biggest challenge of Donald Trump's presidency: trying to bridge internal divisions over proposed cuts to Medicaid and popular green energy initiatives to pay for a landmark tax-cut bill they hope to enact by July 4.

Trump's second-term approval rating has been compared with that of his predecessors by US polling firm Gallup, which has used the 100-day milestone for decades. Trump is the first post-war president to serve two non-consecutive terms,

President Trump has swiftly reshaped the federal government: redefining the scope of executive power, testing and defying the courts, and targeting his perceived enemies. Why it matters: The president's team has been open about his second term's "flood the zone" strategy.