Viktor Orban, the populist prime minister of Hungary, is facing a rare challenge to his grip on power as protesters demand an end to controversial labour reforms and and what they call his assault on democracy.

The Hungarian capital has been rocked by nearly daily protests and opposition MPs have called for Mr Orban's overthrow since the country's parliament adopted a bill liberalising overtime rules on Wednesday.

As part of the reform, which critics have dubbed "the slave law", employers would be allowed to delay payment for overtime worked for up to three years.

Several thousand people gathered outside the offices of Hungary’s state television broadcaster on the fifth night of protests on Monday evening, after two opposition MPs were physically thrown out of the building.

Arkos Hadhazy and Bernadetter Szer were filmed being manhandled out of the MTVA headquarters by security guards earlier in the day, after demanding that the station broadcast a list of protesters' demands.

The pair, among a group of opposition MPs who spent the night inside the building demanding studio access, called a protest for Monday evening in response under the slogan: "They threw us out the door, but we'll go back in through the windows."