Sentence:  My words are not to be misread as a veiled attack on their integrity or their honour. They are intended as a frank and open <WSD>impeachment</WSD> of their judgment. [...] In certain quarters, I doubt not, this <WSD>impeachment</WSD> and this protest will provoke a sneer. 
Meaning of the word marked with <WSD> tags:  The act of calling into question or challenging the accuracy or propriety of something.