The Reform leader also told the BBC's Laura Kuenssberg that his family are "begging" him to leave his job.
Nigel Farage's admirers in the party are calling for a stronger operation as the party aims for power.
Two senior Reform aides have stepped down from their roles following a Channel 4 News and Verbatim film about donations.
Speaking at the party's conference, economy spokesman Robert Jenrick says Reform will be the "party of fiscal responsibility".
The party says the tax cut will be paid for by reducing public spending by £80bn.
The Reform UK leader promises to deliver on key priorities in the first 100 days of government, if the party wins power.
Reform says it would use the Navy to intercept boats and return migrants to France, if the party wins power.
Dame Angela Eagle warns the weather event could lead to extreme storms this winter.
The leaders also discussed Ukraine and "the UK's drive to get closer to Europe", No 10 says.
The Green Party leader intends to run in the Holborn and St Pancras seat following Sir Keir Starmer's resignation as MP.
Reform says Dan Jukes and James Orr have left their roles as it launches an investigation into the report.
Andy Burnham has committed to reaching the Nato target of 3.5% spending by 2035, but not 3% by 2030.
A look at the key allegations concerning foreign donations and where they sit with the law.
Can the Reform UK leader put his policies into action, and become prime minister?
With Argentina's President Milei promising "winds of change" over the Falklands, will Donald Trump shift his stance on British rule?
Burnham's exchanges with Kemi Badenoch slipped into familiar territory of trading barbs, writes Alex Forsyth.
The party's continued prominence has brought what prominence always brings: scrutiny, says BBC political editor Chris Mason.
The Reform leader has been dogged by questions over his finances after receiving a £5 million sum from Christopher Harborne.
Curiously, the questions at lunchtime may well feel like a minor extension of what he faced on Tuesday, the BBC's political editor writes.
As expected, the Reform UK leader easily won the Clacton by-election but was nowhere to be seen after the result.
In an era when reputations can be made or broken with a single post, getting the balance right is tricky.
Economics editor Faisal Islam examines whether the north-west city can be a template for the entire country.
The governing party's poll ratings have improved but they're only just ahead of Reform.
Laura Kuenssberg was given unprecedented access to the new prime minister’s first days in power.
Who is the real Andy Burnham? Laura Kuenssberg talks to more than 20 people who know him to work it out
Nigel Farage, leader of Reform UK, says that for the first time in his career his family he doesn't have his family's support,
Young supporters give their views as the Reform UK party conference takes place in Birmingham.
Do supporters think Reform UK has lost momentum?
Nigel Farage has been addressing Reform UK members at the party's conference in Birmingham.
The Reform leader was speaking following a news report which raised questions about his party's fundraising.
