The press regulator has come under fresh pressure over a ruling against The Telegraph that puts “unreasonable restrictions” on the press’s ability to report parliamentary proceedings.

Senior MPs have expressed concern that free speech is being undermined by the Independent Press Standards Organisation (Ipso) after it issued a reprimand over a report that quoted remarks made in Parliament.

Ipso upheld a complaint by the Muslim Association of Britain (MAB) against The Telegraph over allegations made in Parliament by Michael Gove, the communities secretary at the time, that it was “affiliated” with the Muslim Brotherhood, an organisation banned as a terrorist group in some countries.

Mr Gove’s comments were made under parliamentary privilege, which protects politicians against legal action over anything they say in Parliament, and which also effectively extends to the reporting of those proceedings.