Richardson said Suu Kyi - whom he described as a long-time friend - had developed a "siege mentality" in her position as Myanmar's State Counsellor, the country's civilian leader, but added that Western governments should continue to engage with her.
The next day, Richardson, a former USA ambassador to the United Nations and a long-time ally of the state counsellor, did not join the board as it left on a trip to Rakhine State.
Myanmar nationals Wa Lone, 31, and Kyaw Soe Oo, 27, face a possible 14 years in prison under the Official Secrets Act for allegedly possessing classified documents that they say were given to them by two policemen. He also described her "furious" reaction when he brought up the case of two Reuters journalists arrested while covering the crisis.
Richardson said that before his trip to Myanmar, he spoke to US Secretary of State Rex Tillerson, who visited the country in November.
"It appears that the Board is likely to become a cheerleading squad for government policy as opposed to proposing genuine policy changes that are desperately needed to assure peace, stability, and development in Rakhine State".
President Duterte earlier hit Suu Kyi for her failure to address the Rohingya crisis as he defended his drug war from human rights advocates, saying there worse abuses happening in the world.
The Nobel laureate has been criticized by her own fellow Nobel prize winners for her seeming lack of sympathy for the Rohingya.
Richardson could not immediately be reached for comment on Thursday.
He publicly expressed concern that Surakiart was not "genuinely committed" to implementing the recommendations made last August, just as the current crisis erupted, by the Rakhine Advisory Commission led by former United Nations chief Kofi Annan.
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Recently appointed Deputy Information Minister U Aung Hla Tun told reporters in Naypyidaw on Friday that Richardson had raised an issue that was beyond the commission's mandate, and pointed out that the trial of the two reporters could only be dealt with by the president. It is Contempt of Court.
They have brought with them consistent testimony of murder, rape and arson in violence the United Nations and USA have condemned as ethnic cleansing.
"The security will be provided...the subject is so internationally covered so I don't think (Rohingya) people should be scared", he said.
Richardson also accused Daw Aung San Suu Kyi of disparaging United Nations and human rights workers, INGOs as well as the global community.
A USA official, who spoke on Thursday on condition of anonymity, said the issues raised by Richardson had reinforced concerns about Myanmar´s handling of the Rohingya crisis.
"We already published a statement and also the advisory board published a statement".
After touring temporary repatriation camps set up by Myanmar, Meyer said he thought the country was ready to take back the Rohingya refugees under an agreement with Bangladesh, where they are now sheltering. The remaining members of the advisory board on Wednesday toured temporary camps the government has set up for returnees.
Meyer said, "It's quite clear that there is an effort being made and hopefully that will encourage people to come back".