From the Summary: "A 2011 uprising by a mostly Shia opposition to the Sunni-minority-led regime of Bahrain's Al Khalifa ruling family has subsided, but punishments of oppositionists and periodic demonstrations continue. [...] The Bahrain government's repression of its opponents has presented a policy dilemma for the United States because Bahrain is a longtime ally that is pivotal to maintaining Persian Gulf security. [...] The Trump Administration has prioritized countering Iran and addressing other regional security issues, aligning the Administration closely with Bahrain's leadership on that issue. In keeping with that approach, the Administration lifted the previous administration's conditionality on major arms sales to Bahrain's military and has corroborated Bahrain leadership assertions that Iran is providing material support to violent opposition factions in Bahrain. Critics of the policy assert that the Administration is downplaying human rights concerns in the interests of countering Iran."
CRS Report for Congress, 95-1013
Congressional Research Service: https://crsreports.congress.gov/