Theresa May said Jeremy Corbyn should start tackling antisemitism allegations inside Labour before he criticises the government.
He said the publication of his memos regarding the Trump administration had made it "impossible" for him to carry on.
The former Prime Minister said he would take Mr Johnson to court if he ever suspended Parliament to force through a no-deal Brexit.
Jacob Rees-Mogg said he was surprised that the leadership contender found the idea of lower taxation "controversial".
The Tory leadership contenders had differing views regarding Sir Kim Darroch's future as British ambassador to Washington.
The Labour leader will put pressure on the next Prime Minister to hold a public vote on whether Britain leaves the EU.
The Labour peer warned that Brexit, both with a deal or without, would be an "extreme policy".
The prominent Brexiteer said that after 30 years representing Vauxhall, she would "not seek re-election as a Labour candidate".
The Labour MP is hoping to use his parliamentary privilege to break gagging orders against staff who want to speak out about antisemitism.
The Tory MP said the leak of private messages from Sir Kim Darroch to the UK government was a "betrayal" of the country.
The US president has hit out at the UK's ambassador to Washington, who said in leaked emails that the Trump administration was "inept".
Sir Bernard Jenkin believes leadership contender Boris Johnson can make people “feel good” about being British again.
He has admitted it will be a “stretch” to meet his leadership campaign promise to boost police numbers by 20,000 within three years.
Guy Verhofstadt slammed a speech by the MEP, which compared Brexit to slaves rising up against their owners.
She believes Boris Johnson can successfully boost police numbers by 20,000 within three years if he becomes Prime Minister.
He pledged to boost police numbers by 20,000 in three years if he wins the leadership contest.
The Brexit Party leader has called for an overhaul of the political system and the abolition the House of Lords.
Police investigating an allegation of the burning of ballots in the Peterborough by-election have concluded that no offences were committed.
Mr Johnson was facing allegations of misconduct in a public office after claiming that the UK sends £350 million a week to the EU.
The brother of Labour's Jeremy Corbyn has come to his defence, after senior civil servants claimed the politician was "too frail" to be PM.
The Brexit Party MEP was one of 29 who turned their backs as the EU's Ode To Joy anthem played at the European Parliament in Strasbourg.
The Tory MP defended describing a homelessness charity as a "magnet for undesirables", claiming he was quoting his constituents.
He said the leadership frontrunner has a “clear” plan for leaving the European Union despite a gridlocked Parliament and an unmoving EU.
He claimed the German chancellor is willing to look at new Brexit proposals put forward by the next Prime Minister.
Downing Street has denounced comments by senior civil servants that Jeremy Corbyn is “too frail” to be Prime Minister.
There were 101 reports of letters being sent with intent to cause distress in 2018 - more than double the 39 sent in 2016.
He said Jeremy Hunt’s proposed £6 billion war chest to prepare for a no-deal Brexit can give the UK credibility during EU negotiations.
The leadership hopeful said farmers should be treated like banks were during the 2008 financial crash in the event of a no-deal Brexit.
He joked he would make rival Boris Johnson the "Secretary of State for Collective Responsibility".
She said the choice of either candidate is like “asking me if I'd prefer to be run down by a lorry or a bus”.
The Foreign Secretary slammed Boris Johnson’s claim that the chance of a no-deal Brexit is a “million-to-one”.
The former UKIP leader will stand again for the position, despite leaving the role less than a month ago.
Our Future Our Choice campaigners poured 2,000 plastic ducks outside a building they believed to be Boris Johnson’s campaign office.
Women should not be sent to jail, an MP has said, amid calls for a better system for those who have broken the law.
The MP said he will get "nothing" in return if cannabis is legalised, despite chairing a drugs reform group backed by cannabis corporations.
The MP said that comments from Jeremy Hunt that equated Northern Ireland veterans with IRA terrorists were “outrageous”.
Tory MP Alok Sharma said he supported Boris Johnson's pledge to deliver an Australian-style points-based immigration system.
He declined to rule out suspending Parliament in order to force through Brexit by the October 31 deadline.
Theresa May is to hold talks with Russian President Vladimir Putin when the two leaders attend the G20 summit in Osaka, Downing Street has said.
An MP has called for the creation of an independent regulator for football to “restore faith” in the game.
In a heated exchange during Prime Minister's Questions, Mrs May said the opposition leader should "never be Prime Minister".
Angela Eagle was visibly upset as she defended the teaching of same-sex relationships in schools.
Sir Bernard Jenkin said Britain risks being stuck in a perpetual extension of the Brexit deadline if it fails to leave on October 31.
He has rubbished Boris Johnson’s claim the UK could use world trade rules to continue tariff-free trade with the EU in a no-deal Brexit.
Jeremy Hunt has hit out at his fellow Tory leadership candidate after Boris Johnson called on him to commit to leaving the EU on October 31.
talkRADIO's political editor Ross Kempsell has shared his thoughts after interviewing the Tory leadership frontrunner.
Boris Johnson is not taken seriously by politicians abroad, Conservative MP Dominic Grieve has claimed.
He has reaffirmed his commitment to leaving the European Union by October 31 “come what may”.
He has once again refused to discuss a late-night incident at his girlfriend’s home that led to police being called to the property.
The majority (64 per cent) of Conservative voters do not think Boris Johnson should answer questions about a disturbance at his flat, a survey has found.
Dawn Butler has come to the defence of Boris Johnson's neighbours, who called the police after a row broke out at the politician's home.
The former MP has been selected to fight for the seat he lost after more than 10,000 constituents signed a petition to remove him.
The 81-year-old was taken to a hospital in Hull on Friday his family revealed in a statement.