The first minister has called on the leader of Welsh Labour to work with his government to secure more funding for children with additional learning needs (ALN).

Rhun ap Iorwerth said there was "a small window" to agree a deal.

It comes after Labour MSs helped to defeat the Welsh government's spending plans in July because of a lack of money for ALN.

Welsh Labour leader Ken Skates said the money on offer was "still not enough".

A Labour source said it was as though the government had "learnt nothing" over the summer.

Meanwhile, Finance Minister Elin Jones has written to opposition leaders in the Senedd in the hope of making "progress".

In her letter, seen by BBC Wales, Jones said she was keen to hold another vote on her spending proposals "as soon as possible".

Without a majority in the Senedd, the Plaid Cymru government needs support from opposition Members of the Senedd (MSs) to win votes.

In July, Labour - along with Reform, the Conservatives and the only Liberal Democrat MS - voted against the Welsh government's supplementary budget.

Labour had called for £100m to be spent on ALN during the current financial year.

In its final offer on the eve of the vote, the government proposed spending an additional £40m on ALN this year, with a further £80m to come over the next two financial years.

Labour's decision to reject the offer came as two teaching unions - NAHT Cymru and ASCL Cymru - also warned of an "ongoing crisis" in ALN funding.

However, in her letter on Tuesday, Jones said there has been a "significant development" with ASCL Cymru now calling on the government to spend £100m on ALN over the current and next financial years.

Jones added that the government had "committed to carefully consider all points raised [by ASCL Cymru], including the case for an increased level of funding in 2028-29".

However, she also warned that "as a minority government, delivering additional funding for schools depends on agreement with other parties in the Senedd".

And she pointed out that time was running out to spend any additional money during this financial year, ending in early April.

Speaking during Tuesday's First Minister's Questions, ap Iorwerth told Welsh Labour leader Ken Skates: "My finance minister has written today to all the party leaders here in the Senedd asking to come together, asking for co-operation."

"There is still a small window to get out through that door the £40m on the table," the first minister said.

"It's still an offer, and it's a genuine offer to work co-operatively with you to get that money spent."

Ap Iorwerth also referred to recent comments by former Labour first minister and finance secretary Mark Drakeford who has said that "there was a case" that Labour should have accepted the Plaid Cymru deal in July.

Responding to ap Iorwerth in the Senedd chamber, Skates said the money on offer was "still not enough".

Later, a Welsh Labour source told BBC Wales that the first minister "should reflect on whether repeating the same failed tactics as July is the best approach to secure an outcome".

"It's as though they've learnt nothing over the summer," the source added.

NAHT Cymru remains in formal dispute with the Welsh government and is currently consulting its members on possible strike action.