The Sinn Féin leader says the idea of a bridge between Northern Ireland and Scotland is just a distraction from Brexit talks.
The British government has reportedly ordered a feasibility study into the costs and challenges of building a bridge in the Irish Sea.
Boris Johnson had previously mooted the idea during his time as the British foreign secretary - earning the proposal the nickname 'Boris bridge'.
However, Channel 4 yesterday reported that officials "have been asked for advice on the costs and risks of such a project".
Without referencing the proposal directly, a British government spokesperson told Channel 4: "This [prime minister] has made no secret of his support for infrastructure projects that increase connectivity for people and particularly those that strengthen the Union.”
According to the report, the DUP is said to believe such a project could be a way of helping break the ongoing Brexit deadlock.
Sinn Féin leader Mary Lou McDonald, however, doesn't take the idea too seriously.
Speaking today, she argued: "I don't think the 'Boris bridge' is a real proposal.
"There are so many huge infrastructural needs on the island, I don't think we should get lost in a distraction about a bridge."
Deputy McDonald added: "Although one would have to say that there is something attractive in the notion of a bridge between an independent Scotland and a united Ireland."
