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But Bahrain has been repeatedly criticised for its problematic human rights record, including a that detailed "serious human rights problems" in the country.

These included citizens' limited ability to peacefully choose their own government, curbs to freedom of expression and assembly, a lack of due process, and the arrest and imprisonment without warrants or charges, "especially in cases against opposition members and political or human rights activists", the report found.

Human Rights Watch also Bahraini courts "convict and imprison peaceful dissenters and have failed to hold officials accountable for torture and other serious rights violations".

Security officials have meanwhile been accused of using disproportionate force to stem peaceful protests or unrest. Bahrain quashed widespread, pro-democracy protests during the Arab Spring in 2011.

"Allowing the F-16 deal with Bahrain to continue sans restrictions could set a precedent for arms sales in the Gulf region and around the world - that the United States will not demand respect for human rights as a prerequisite for governments that wish to purchase American military weapons and equipment," non-profit group Americans for Human Rights and Democracy in Bahrain last month.

Human rights provisions in weapons sales "set exactly the right precedent", the group said, "that the United States is committed to the promotion and protection of human rights and fundamental freedoms around the world".

In February, an anonymous US official told right-wing newspaper The Washington Times that the Trump administration was set to approve stalled weapons transfers to both Bahrain and Saudi Arabia.

"These are significant sales for key allies in the Gulf who are facing the threat from Iran and who can contribute to the fight against the Islamic State," .

"Whereas the Obama administration held back on these, they're now in the new administration's court for a decision - and I would anticipate the decision will be to move forward."

Arab states in the Gulf often cite a perceived threat from Iran as a driving force behind their weapons imports, and a reason for their suppliers to justify the sales, according to the Stockholm International Peace Research Institute (SIPRI).

The US sold $33 billion worth of weapons to the Gulf Cooperation Council (GCC) countries - Bahrain, Saudi Arabia, United Arab Emirates, Oman, Qatar and Kuwait - in less than a year between 2015 and 2016, .

SIPRI data that all GCC countries, except for Bahrain, increased their weapons imports between 2007-2011 and 2012-2016.

Qatari imports increased by 245 percent between the two periods, compared with 212 percent in Saudi Arabia, 175 percent in Kuwait and 63 percent in the UAE. Bahraini imports, meanwhile, decreased by 19 percent.