Former Prime Minister Boris Johnson has urged the government against building a “mutilated” version of HS2.
He said suggestions the high-speed rail link that began construction under his premiership could be scaled back were “Treasury-driven nonsense”.
Last week, the government refused to guarantee HS2 would continue between Birmingham and Manchester.
The BBC understands a definitive decision on HS2 will be made in the coming week.
On Saturday, more than 80 companies and business leaders seek clarity over the commitment to HS2.