Martin Lewis replaced Richard Madeley on Good Morning Britain today as he co-hosted the show with Susanna Reid.
Last week, Richard announced he was taking a break from the show and wouldn't return until after Christmas.
Today, MoneySavingExpert founder Martin filled in for the departing presenter.
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He quizzed International Trade Secretary Anne-Marie Trevelyan on the issue of paid lobbying in the aftermath of the Owen Paterson row.
However, Good Morning Britain viewers loved Martin's challenge to Ms Trevelyan on whether the seven Nolan principles in public life were in play when the vote to overturn Owen Paterson's parliamentary suspension was considered.
Complimenting his questioning and interviewing style, Maria tweeted: "@susannareid100 Martin is fantastic, you seem so at ease working with him. Much better than Madeley."
Neil wrote: "Welcome back Martin. Thanks for being back on @gmb Can't you make it permanent?"
Michael said: "Good to see you on Good Morning Britain again. Some of the best journalism I've ever witness on British TV. Good job."
Another tweeted: "Damn, Martin Lewis is good."
Debbie commented: "Think they should make you permanent presenter...doing a fab job."
Stavros tweeted: "Why can’t we have Martin & Susanna hosting #GMB together every day?"
And Kate said: "@MartinSLewis is just brilliant."
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