The Taoiseach says he doesn't believe alternative arrangements on the Brexit backstop exist.
Last night, the British House of Commons voted to look for other arrangements to avoid a hard border with Northern Ireland.
Leo Varadkar dismissed suggestions that there's another way of avoiding a hard border instead of the backstop:
In terms of the Brady amendment it speaks of alternative arrangements - i don't know what those alternative arrangements are.
We've been down that track before, and I don't believe that such alternative arrangements exist.
The Taoiseach is due to speak with Theresa May about the latest Brexit developments today.
He's also said he may travel to Brussels next week for talks.
Meanwhile, Tanaiste Simon Coveney has also insisted that the withdrawal agreement cannot be re-opened, despite Theresa May's requests for more talks:
There are currently no alternative arrangements which anybody has put forward which achieve what both sides are determined to achieve - to avoid a hard border.
