In the end, it wasn't one scandal that brought down Boris Johnson. It was a series.
While each transgression was unique, they shared this truth: The British prime minister is a liar.
The weight of the untruths finally became too much even for Conservative parliamentarians. In recent days about 50, from closely allied Cabinet secretaries to ministers and lower-level officials, resigned with refrains that the serial mistruths on matters political and personal made Johnson's continued tenure untenable.