The phrase "unrelenting assault" means a continuous and aggressive attack or action that does not stop or show any sign of slowing down. Full definition
Mr Rivkin commented: «President Erdogan's fierce and unrelenting assault on Turkey's democratic institutions in violation of international law and the nation's Constitution has removed any credibility for his actions. (lawyer-monthly.com)
Ms Morgan inherits a teaching profession on the brink of a recruitment and retention crisis after an unrelenting assault on teachers» pay, pensions and conditions and their professionalism. (politics.co.uk)
[Nicky] Morgan inherits a teaching profession on the brink of a recruitment and retention crisis after an unrelenting assault on teachers» pay, pensions and conditions and their professionalism. (theguardian.com)