Palestinian activist Raed Salah has been granted permission to appeal against a tribunal ruling which agreed he should be removed from Britain.
Last month an immigration tribunal found in favour of Home Secretary Theresa May's order that Sheikh Salah should be banned from Britain as his presence "would not be conducive to the public good".
He appealed on six grounds and was successfully granted permission to go ahead with the appeal to the Upper Tribunal.
Sheikh Salah can remain in Britain for as long as the appeal process takes. It is not known when the case will be heard.
Tayab Ali, Sheikh Salah's solicitor, said: "Being granted permission to appeal on all grounds is highly significant. It is clear that the Home Secretary has repeatedly exercised poor judgment.
"The Home Secretary has consistently failed to show what evidence of actual harm might exist that would justify a government preventing Sheikh Salah from addressing legislators, policy makers and the British people.
"The Home Secretary has also failed to present any evidence that Sheikh Salah's previous visits to Britain have caused any detriment to public order or community relations".
The Home Office had previously said it was pleased the tribunal agreed to his removal and that it would seek to deport him "at the earliest opportunity". That move is now on hold.