[NEMDF]

He needs to provide factual statistics to support this claim, IMHO. Trump surrogates need to demand that the media demand the data from Kaine.

[gleeaikin]

Here are some statistics. The first one speaks in general terms. Back to find actual lists.

http://www.unwomen.org/en/what-we-do/leadership-and-political-participation/facts-and-figures

This has more charts but tends to list USA in the category Americas where our 19% in Congress tends to drag the figures down.
https://www.weforum.org/agenda/2015/01/where-are-the-women-in-global-leadership-7-charts/

Here is the mother lode of legislators, by country: http://www.ipu.org/wmn-e/classif.htm

Here is the mother lode of presidents, by country, both current and past and dates in office, several charts. Check them all.
http://www.jjmccullough.com/charts_rest_female-leaders.php