Buddhadev had written a strong letter of protest to Manmohan Singh objecting to Mulford's behaviour.
Taking serious exception to US Ambassador David Mulford writing directly to West Bengal Chief Minister Buddhadev Bhattacharjee for his remarks against the American President, the CPI-M on Friday said the party expected a response from Prime Minister Manmohan Singh on the issue.
"The US ambassador does not seem to understand how to behave in this country. An ambassador has to behave according to certain norms," CPI-M general secretary Prakash Karat told reporters at the end of the two-day politburo meeting of the party in Kolkata.
In a letter, Mulford had objected to the Chief Minister's description of US President George Bush as a leader of the "most organised pack of killers" at an election rally in Kolkata on January 8.
Mulford had also said such remarks would be detrimental, especially in inviting US investors to West Bengal.
Karat said the CPI-M had earlier demanded Mulford's recall following his comment on the Left parties' stand on FDI in retail trade.
He said the ambassador had no business to write to the chief minister directly.
Bhattacharjee, he said, had written a strong letter of protest to Manmohan Singh objecting to Mulford's behaviour.
"The Prime Minister has got the chief minister's letter by now. We expect a response from him," Karat said.