Poland should recommit to the respect for democracy, human rights, and rule of law, three U.S. senators said in a letter sent to the prime minister.
The senators were referring to new laws on media and the constitutional court.
Poland's ruling party, the conservative and eurosceptic Law and Justice (PiS), has packed the constitutional court with its appointees and changed the court's voting system, curbing its ability to censure legislation.
It has also passed a law giving the government direct control over the appointment of public media chiefs, raising concerns as well within the EU.
U.S. three senators -- Ben Cardin, John McCain and Richard J. Durbin -- said in their letter to Beata Szydlo dated on February 10 that they were concerned about the actions taken, saying they threaten the independence of state media and the country's highest court.
In reply, Szydlo blamed the former government for the situation in the constitutional court and said the new media law did not breach any European standards.
Based on reporting by Reuters