Since arriving at the programme, her scoops have included the arrest of David Cameron's aide Steve Hilton and the disclosure that illegal immigrants worked at the Home Office.
Cathy also writes for the FactCheck blog, which sorts the facts from the spin and unpicks politicians' claims and counter-claims. It has been cited in Parliament, imitated by rivals, and loyally followed on Twitter.
Before Channel 4 News, Cathy worked for the Financial Times and the Independent.
Extending the right to a civil partnership could to straight couples could cost the state up to £4bn, according to countless headlines. FactCheck isn't convinced.
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As Rod Stewart celebrates a number one album, the 68-year-old tells Cathy Newman he hasn't joined the "pipe and slippers club yet" and jokes that there is "nothing wrong with a bit of sleaze".
Also on #C4News at 7.30: the chair of the PAC on Google whistleblower's new claims on the company's tax avoidance and...Rod Stewart
— cathynewman (@cathynewman) 19 May 2013
On #C4News tonight: why Imran Khan says British government is partly responsible for death of one of his political colleagues
— cathynewman (@cathynewman) 19 May 2013
Rod Stewart on 70s sleaze: he was "just having a good time, shagging, drinking, nothing wrong with that". #C4news 7.30 tonight
— cathynewman (@cathynewman) 19 May 2013
Rod Stewart and me. Watch #C4news at 7.30 as his album heads for no 1 for first time in nearly 4 decades. http://t.co/IKDc6rjZ2t
— cathynewman (@cathynewman) 19 May 2013
As Rod Stewart heads for first number 1 studio album in nearly 4 decades I'm about to interview him for tonight's #C4News #rocknroll
— cathynewman (@cathynewman) 19 May 2013
Frankie Dettori: "I feel like Lance Armstrong" - full exclusive interview on #c4news tonight 7pm, watch preview here http://t.co/ZpUhhI9KGe
— cathynewman (@cathynewman) 16 May 2013
Can accident and emergency departments really be hitting their targets if the system is in danger of meltdown? FactCheck finds out.
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Hedge fund manager Lord Fink talks about his plans for huge charity parties and the Conservative party's ructions over Europe.
Watch #C4News coming up for top Tory donor on philanthropy, Boris Johnson and Europe
— cathynewman (@cathynewman) 15 May 2013
Coming up next on #C4News an exclusive report on whether the government's doing enough to protect NHS whistleblowers
— cathynewman (@cathynewman) 15 May 2013
Watch #C4News tonight for my interview with Tory donor Lord Fink on his latest charity effort and verdict on Europe - MPs too "emotional"
— cathynewman (@cathynewman) 15 May 2013
After the home secretary announces plans to ensure people convicted of killing police officers get life for life, FactCheck digs in to the announcement.
Shortly on #C4News - Angelina Jolie is challenging society's view of womanhood and beauty. New footage from my trip to the Congo with her
— cathynewman (@cathynewman) 14 May 2013
Channel 4 News accompanied Angelina Jolie on a mission to Congo earlier this year. The actress made the gruelling trip despite undergoing major surgery, writes Cathy Newman.
Having travelled with Angelina Jolie in Congo she showed zero sign of pain, despite having just had major surgery. More on #C4News tonight
— cathynewman (@cathynewman) 14 May 2013
Talking Europe, birds vs buildings and Bowie on tonight's #C4news I respectfully invite you to tune in at 7
— cathynewman (@cathynewman) 13 May 2013
It was widely reported today that Chris Huhne and Vicky Pryce had been given time off "for good behaviour". But there is no such thing, as FactCheck finds out...
Coming soon to a bookshop near you: the revealing inside account of how Vicky Pryce lost her freedom, her career and her husband. Or maybe not.
