In a letter to Kerry obtained by The Associated Press today, the House members, both Democrats and Republicans, say that sectarian violence has spread, and that President Thein Sein's government seems to be catering to and stoking anti-Muslim sentiment.
They also voiced concern about military abuses against ethnic minorities, the recent jailing of journalists, and the need for constitutional reform.
The Obama administration has counted its support for former pariah state Myanmar's shift from direct military rule as one of its principal foreign policy achievements, but the letter reflects mounting congressional concern over the direction the Southeast Asian nation has taken after Washington suspended its toughest sanctions in 2012.
"Just as the beginning of the reform process required a calibrated reassessment of US policy three years ago, recent disturbing developments call for a significant recalibration now," the letter says.
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Kerry is expected to visit Myanmar for the Association of Southeast Asian Nations Regional Forum being held in Naypyitaw on Aug 10, and also hold bilateral meetings with Myanmar officials.
Signatories to the letter include Democrat Rep Joe Crowley, a prominent congressional voice on Myanmar, and Republican Rep Steve Chabot, who chairs a House panel that oversees policy toward Asia, and the top-ranking members of the House Foreign Affairs Committee.