Speaking on his LBC show, the commentator asked Lord Newby why his vote was “worth more” than his listeners’ vote to leave the European bloc.
It comes after the House of Lords voted for an amendment for Parliament to have a say on a future Brexit deal after it passed an amendment to secure the rights of EU nationals in the UK.
Ferrari probed his guest, the leader of the Lib Dem lords, about wanting another EU referendum.
He said: "I've got a note here that you were suggesting if there's a rerun that sixteen-year-olds should have a vote. That is the goal isn't it of many in the House, possibly yourself included, you want a rerun of the referendum?”
Nick Ferrari took Lord Newby to task over the Lords' amendment to Theresa May's Brexit bill
The point of the House of Lords is to look at legislation and to ask the House of Commons to think again about aspects of it if we think they’ve got it wrong
Lord Newby responded: "Well, this was a separate amendment that we voted on earlier in the day. We want a first referendum on the terms. People when they voted last June had 57 varieties of different outcomes in their mind.
"We only have one possible outcome at the end and we think that people should have the final say."
But Nick insisted: "So you do want another referendum and this time you want 16-year-olds. So what intrigues many of my listeners is why is your vote worth more than theirs?"
Lord Newby insisted his vote was not “worth more than anybody else’s” before Ferrari interrupted.
All the pictures from Brexit Bill Tuesday Tue, March 7, 2017
Theresa May is facing a second defeat on her Brexit bill Tuesday as the House of Lords votes on another change which would give parliament the final say on leaving the EU
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Archbishop of Canterbury, Justin Welby, speaks in the House of Lords Chamber at the start of the third day of The European Union (Notification of Withdrawal) Bill
Lord Newby insisted the House of Lords was not trying to derail Brexit
“Well it is, respectfully Lord Newby, because you can stop the whole thing from proceeding,” the host added.
The former Lib Dem Lords' chief whip assured Ferrari the House was “certainly not going to stop the whole thing proceeding”.
“The point of the House of Lords is to look at legislation and to ask the House of Commons to think again about aspects of it if we think they’ve got it wrong,” he added.
“And that’s what we’re doing in this case. If you don’t think the House of Lords has that power, you might as well abolish the House of Lords.”
The radio presenter reminded the guest the Lords were “dangerously close” to being abolished.
“Don’t you think you’re moving dangerously close to that area with the amount of public sympathy awarded to the House, at best, sorely tested,” Ferrari fired.
But Lord Newby hit back: “No I don’t at all, we passed two amendments that go back to the Commons… I think they’re both common sense.”