HANOI, Vietnam—Vietnam's government has asked its citizens to debate planned revisions to the country's constitution. But when journalist Nguyen Dac Kien weighed in on his blog, he quickly discovered the limits of its willingness for discussion. His state-run paper fired him the next day.

Kien had taken issue with a statement by the Communist party chief in which he said discussions over the revisions should not include questions over the role of the party.

In a post Monday that rapidly went viral, he wrote that the party chief had no right to talk to the people of Vietnam like this, and that state corruption was the real problem. He was fired Tuesday.

Kien said Wednesday he wasn't surprised by his firing, and that he is committed to democracy.