Evening top 5: Heatwave continues; Brexit and a united Ireland; and "Oirish" ads

The top stories this Monday evening...

Met Éireann issues weather warning for high temperatures

A yellow weather warning has been issued for the entire country for high temperatures on Tuesday.

Met Éireann says temperatures will reach over 27 degrees in many areas.

The warning is in place from 10.00am until 8.00pm.

Brexit talks should include the "possibility" of a united Ireland - Enda Kenny

The Taoiseach Enda Kenny says the European Union needs to prepare for the prospect of a united Ireland, as part of the talks on Brexit.

Mr Kenny says the transfer of Northern Ireland back to the Republic is something that must be considered.

The Taoiseach pointed out that East Germany did not have to apply for EU membership in 1990 when Germany was reunited.

Man critical following serious assault in Co Leitrim

Gardaí in Leitrim are investigating a serious assault which has left a man in critical condition.

The 30-year-old man was found unresponsive on the road in Carrick-on-Shannon early Sunday morning.

Just before 4.00am yesterday, gardaí received a report that a man had been assaulted and was lying on the Main Street in the town.

"Probably the darkest day in sport in terms of doping" - State-sponsored doping casts doubt over Russian Olympic participation

Russia operated state-sponsored doping programme at Sochi 2014 Winter Games, according to a new report released today.

The investigation, chaired Richard McLaren, says that the Russian sports ministry "directed, controlled and oversaw" manipulation and tampering of urine samples provided by athletes.

WATCH: US ads go awfully "Oirish" to attack corporation tax

The Republican convention kicks off in Cleveland, Ohio, today and to coincide with the week-long event, TV viewers in hotel rooms across the US city will be met with a series of political advertisements taking aim at the country's 35% rate of corporation tax.

To do so, the RATE Coalition, a lobby group comprised of American businesses, has looked to the Irish.