Former Welsh Secretary Paul Murphy has urged the UK Government to transfer control over some minor taxes as soon as possible.
He said it would trigger the borrowing powers he claimed are vital for the Welsh Government.
In reply, the current Welsh Secretary David Jones acknowledged that the transfer of smaller taxes could be added to other legislation going through parliament.
More top news
Alexandra Lodge has been to Aberconwy, where Plaid Cymru, the Conservatives and Labour are all hoping to claim victory.
Cloudy skies to start the day, and rather windy with prolonged rainfall during the morning which will be heavy at times.
ITV Cymru Wales will publish the final poll of the Welsh Assembly Election 2016 campaign on Wednesday this week.