The twin votes in the House of Representatives added to a growing climate of fear that Duterte is determined to silence anyone critical of his war on drugs, which has claimed thousands of lives and led rights groups to warn of a crime against humanity.
Duterte directly drew a link between Tuesday night's vote to cut the Commission on Human Rights' annual budget from 678 million pesos ($13 million) to 1,000 pesos and its investigations of the drug war killings and related criticism by its chairman.
"They only gave him 1,000 pesos (about $20) because Congress is angry."
The commission is one of several independent government bodies set up by the constitution to check the power of the executive branch, which controls the country's police and military forces.
The Supreme Court is meant to be another safeguard.
Duterte's allies in the lower house's justice committee on Wednesday also voted to impeach its chief justice after determining corruption allegations against her had substance.
The chief justice, Maria Lourdes Sereno, has been another critic of the drug war.
Duterte responded by threatening to declare martial law if Sereno continued to interfere in his drug war.
Should the entire house endorse the justice committee's findings against Sereno, the Senate would convene as an impeachment court.
The Senate still has to review and endorse the vote to slash the rights commission's budget.
The Senate is also dominated by Duterte allies, but it has proved more independent than the lower house and it could still over-rule the moves against the rights commission and Sereno.
"This leads us on a direct path to dictatorship," Senator Francis Pangilinan, leader of the Liberal Party, the country's main opposition group, said in response to Tuesday's vote.
Teodoro Casino, a former House member representing the left wing Bayan Muna party, expressed similar sentiments when commenting on the move against Sereno.
Disclaimer: No Business Standard Journalist was involved in creation of this content
