For reasons explained in this blog you'd expect
at best politicians aligned with renters and/or the
youngest generations to say such things and even then
they have to take into account the superior voting power
of older generations who mostly own property. There seems to be a (historical, at least) correlation between politicians' positions on such matters and the percentage of people who own houses.
Consequently, the measures proposed will usually not say explicitly
they want to drive down property values, but instead propose
rent controls etc. In the US, politicians from the leftist
wing of the Democratic party have made such proposals, e.g.
Alexandria Ocasio-Cortez and Bernie Sanders have
made such rent-control proposals at a national level.
On the other hand, studies on the effects of de-control have shown
a greater increase in property values in de-controlled areas. So
it is implicit that price controls will at least limit the rise in
value of property prices.
In general, it seems based on surveys that both Republicans and Democrats would favor an increase in housing supply (and depending how much that supply increase is, it could limit or even drive down prices). But when it comes to specifics, e.g. building duplexes in the suburbs, such measures have been defeated on a broad bipatisan basis as well (and decried as "war on the suburbs"). Everyone wants an increase in supply, but mostly not "in their back yard".