Varadkar tendered his resignation as taoiseach, or premier, to President Michael Higgins after the first sitting of Ireland's lower house of parliament since an 8 February election which radically recast the political landscape.
Micheal Martin, leader of Fianna Fail, the largest opposition party in Ireland, said that he welcomed the new Brexit deal reached although he believed that it was "not ideal".
The meeting between the two leaders will take place in the north-west of England, with Johnson still insisting the UK will leave the European Union (EU) with or without a deal on October 31
The EU is concerned that the UK wants to leave too many details about customs and regulatory checks to be agreed during the transition period after Brexit.
He will hold talks with Northern Ireland's main political parties to discuss the restoration of the British province's power-sharing government which collapsed in January 2017.
A no-deal Brexit could lead to a united Ireland as more people in Northern Ireland would “come to question the…
Over 66% people voted against the present anti-abortion laws. Indian-origin PM Leo Varadkar hailed the country's "quiet revolution"
"The people have spoken. They have said we need a modern Constitution for a modern country," Varadkar said.
