An MP who has only been in post for seven weeks said she considered resigning last night after an angry session in the Commons chamber left her feeling "very depressed".
The Leader of the Welsh Liberal Democrats, Jane Dodds, won a by-election in Brecon and Radnorshire last month.
She told ITV Cymru Wales that angry exchanges between MPs, ministers and the prime minister contributed to "one of the most shameful times" she had ever participated in.
Speaker John Bercow said the atmosphere in the Chamber was the "worse than any I've known in my 22 years".
The Brecon and Radnorshire seat became vacant after the former Conservative MP Chris Davies was found guilty of making false expenses claims.
More than 10,000 constituents signed a recall petition which triggered a by-election, which was won by Jane Dodds and the Liberal Democrats.