Question...

[Kassandra]

Hello again!
Can anybody explain to me what ist meant by this:

"Those who argue with his facts must still grapple with his argument."

I have no clue...
It would be great if there is someone who could paraphrase this sentence for me!
Thanks in advance!

[Tdol]

It means that he might haver got his facts wrong, but his argument still needs to be taken seriously. 'Grapple' is the same as 'wrestle/struggle', so the writer is suggesting that saying his facts are wrong doen not disprove his argument.