Anti-Brexit demonstrators wave Union and EU flags and hold up a placard mentioning Phillip Lee, a minister who resigned today after disagreeing with the government's handling of Brexit, opposite the Houses of Parliament in London, Britain, June 12, 2018.

Anti-Brexit demonstrators wave Union and EU flags opposite the Houses of Parliament in London, Britain, June 12, 2018. Image used for illustrative purpose.

Anti-Brexit demonstrators holds a spoof bank note featuring Brexit supporting Conservative MP Jacob Rees-Mogg during a protest opposite the Houses of Parliament in London, Britain, June 12, 2018. Image for illustrative purposes.

Harmony Birch takes a break from an anti-Brexit demonstration opposite the Houses of Parliament in London, Britain, June 11, 2018.

Anti-Brexit demonstrators protest opposite the Houses of Parliament in London, Britain, June 12, 2018.

A passenger ona bus looks at anti-Brexit demonstrators waving Union and EU flags opposite the Houses of Parliament in London, Britain, June 12, 2018.

Anti-Brexit demonstrators protest opposite the Houses of Parliament in London, Britain, June 12, 2018.

Pies are decorated with EU flags during an anti-Brexit protest opposite the Houses of Parliament in London, Britain, June 12, 2018.

Anti-Brexit demonstrators hold Union and EU flag themed umbrellas opposite the Houses of Parliament in London, Britain, June 12, 2018.

An anti-Brexit demonstrator holds a Union and EU flag themed umbrella opposite the Houses of Parliament in London, Britain, June 12, 2018.

Arron Banks and Andy Wigmore, who ran the Leave.Eu pro-Brexit referendum campaign, leave after giving evidence to the Digital Culture Media and Sport Parliamentary Committee in London, Britain, June 12, 2018.

Anti-Brexit demonstrators wave Union and EU flags opposite the Houses of Parliament in London, Britain, June 12, 2018.

Carol White from Essex holds an E.U. flag during anti-Brexit demonstration opposite the Houses of Parliament in London, Britain, June 11, 2018.