The Dáil has set aside eight hours to continue debating a bill to prepare Ireland for a no-deal Brexit.
The Omnibus Bill to deal with a disorderly Brexit must pass all stages in the Oireachtas by Friday 15 March to meet the 29 March Brexit deadline.
While TDs have pledged support for the bill, many opposition members have criticised the timeframe, saying it is being debated too close to the deadline.
They have also called for more details on financial supports from the EU for businesses which may be adversely affected.
During last night's debate, Fianna Fáil TD Brendan Smith said the cost of Brexit is already being felt on the border because of the uncertainty it has created for businesses.
"As a border TD, I am still awaiting a proper answer from government to my question what happens at the border on the 29th March if there is no deal? " Mr Smith said.
Sinn Féin TD Caoimhghín Ó Caoláin said he hoped "sanity will prevail and we will never have to enact what is in this legislation".
However, he warned about uncertainties in the area of cross border health cooperation which he was "deeply concerned about".
Yesterday, Taoiseach Leo Varadkar urged businesses to step up their contingency planning for a no-deal Brexit and utilise the supports that are available as "time is now short".
"Brexit of any kind means change for the worse and no country can be fully prepared for no deal. It is uncharted territory".