Kemi Badenoch has spoken to the media for the first time since the Spring Statement.
The Tory leader said: "It was all smoke and mirrors. I remember the last Budget when Rachel Reeves said she was smashing glass ceilings. Now it feels like the roof is falling over all our heads."
"Growth has halved. Even the forecasts, which she said were promising, are lower than what they were last year. Something has to change. This is chaos.
"We had a costed plan for welfare reforms, saving £5billion over the period. But there was more that we had put in our manifesto.
"We had a plan even before the election. They scrapped our plans. And then they've now rushed out, scrambling things together at the last minute because they were not ready for government.
"They might have been ready for an election, but they had no plan for the reality of government. And everything they're doing is in haste. It's at the last minute. It's not fully thought through."
Probed on her party's use of the "emergency Budget" attack line, Badenoch said: "It is an emergency Budget. She said she would only have one fiscal event a year, and she's had to have this because of the mess that she made with the last Budget."